Oracle PL/SQL: Trigger Syntax

I'm kinda new (like 1 year of experience) in PL/SQL and I have to write a kind of tricky trigger, and I want to check if my syntax is correct, mainly the selects, inserts and variable value store I wrote.

I want to have a trigger that, when I insert a new row into a table, I have to make a select to that table to store inserted values into 2 variables I created:

create or replace trigger schema.trg_CP 
          after insert on "schema"."tdlrp"
          referencing old as old 
          for each row
          
          ---------------------------------------------------------------------------------------------------------      
          declare 
          v_fkidnc                       schema.tdlrp.fkidnc%type;   
          v_errortype                    schema.tdlrp.xerrort%type;
          v_fkerrorID                    schema.tepm.ferror%type;
          v_linerror                     number;
          v_pr                           schema.tpm.pipm%type
          v_pkdocid_r                    schema.tddr.pidr%type
          ---------------------------------------------------------------------------------------------------------
          
          begin
            if inserting then
              select fkidnc, xerrort
                into v_fkidnc, v_errortype
                from schema.tdlrp;
              --

This is correctly made, right?

After that I have to make some if-elsif validations:

1. if v_fkidnc = 1 and if v_errortype = 1 i have to make a set of selects and inserts in a row
2. if v_fkidnc = 1 and if v_errortype = 2 i have to make another set of anothers selects and inserts, but the logic is all the same to every if-elsif validation:

create or replace trigger schema.trg_CP 
          after insert on "schema"."tdlrp"
          referencing old as old 
          for each row
          
          ---------------------------------------------------------------------------------------------------------      
          declare 
          v_fkidnc                       schema.tdlrp.fkidnc%type;   
          v_errortype                    schema.tdlrp.xerrort%type;
          v_fkerrorID                    schema.tepm.ferror%type;
          v_linerror                     number;
          v_pr                           schema.tpm.pipm%type
          v_pkdocid_r                    schema.tddr.pidr%type
          ---------------------------------------------------------------------------------------------------------
          
          begin
            if inserting then
              select fkidnc, xerrort
                into v_fkidnc, v_errortype
                from schema.tdlrp;
              --
              if v_fkidnc = 1 then
                if v_errortype = 1 then
                  select ferror, fipcm
                  into v_fkerrorID, v_linerror
                  from schema.tepm;
                  
                  select pipm 
                  into v_pr
                  from schema.tpm
                  where fipcm := v_linerror;
                  
                  insert into schema.tddr(pidr, fipc, xuser, datea, fiptm) 
                  values(schema.seq_tddr.nextval, old.fipc,'A', systimestamp, v_pr);
                  
                  select pidr
                  into v_pkdocid_r
                  from tddr 
                  where fiptm := v_pr; 
                  
                  insert into schema.tere(pidr, ferror, fidre, xuser, datea, fipcm) 
                  values(schema.seq_tere.nextval, v_fkerrorID, v_pkdocid_r, 'A', SYSTIMESTAMP, v_linerror);
                  
                elsif v_errortype = 2 then
                 select...
EXCEPTION
  WHEN OTHERS THEN
  RAISE;
  
END trg_CP;

For example: on these 2 select i made:

if v_errortype = 1 then
                  select ferror, fipcm
                  into v_fkerrorID, v_linerror
                  from schema.tepm;

                  select pipm 
                  into v_pr
                  from schema.tpm
                  where fipcm := v_linerror;

i'm assigning values to v_fkerrorID and v_linerror (first select). On the second select i want a condition where fipcm is equal to the variable value i stored on the first select:

select ferror, **fipcm**
into v_fkerrorID, **v_linerror**

After that i want to make insert to another tables with the values i stored in above queries:

1. Before the second insert i have to make a select to the table where i first inserted to get the v_pkdocid_r value for the second insert

   insert into schema.tddr(pidr, fipc, xuser, datea, fiptm) 
   values(schema.seq_tddr.nextval, old.fipc,'A', systimestamp, v_pr);
   
   select pidr
   into **v_pkdocid_r**
   from tddr 
   where fiptm := v_pr;
   ----------------------------
   insert into schema.tere(pidr, ferror, fidre, xuser, datea, fipcm) 
                 values(schema.seq_tere.nextval, v_fkerrorID, **v_pkdocid_r**, 'A', SYSTIMESTAMP, v_linerror);
   

Am i doing it correctly?

Edit 16/09/2022

With all the suggestions, i changed my trigger to this:

create or replace trigger schema.trg_CP 
          after insert on tdlrp
          referencing old as old new as new
          for each row
          
          ---------------------------------------------------------------------------------------------------------      
          declare 
          v_fkerrorID                    schema.tepm.ferror%type;
          v_linerror                     number;
          v_pr                           schema.tpm.pipm%type;
          v_pkdocid_r                    schema.tddr.pidr%type;
          ---------------------------------------------------------------------------------------------------------
          
          --
          begin
              --
              if :new.fkidnc = 1 then
                if :new.errortype = 1 then
                  
                  select ferror, fipcm
                    into v_fkerrorID, v_linerror
                    from schema.tepm; --this select only inserts one row to each variable
                  
                  select pipm 
                    into v_pr
                    from schema.tpm
                   where fipcm = v_linerror;
                  
                  insert into schema.tddr(pidr, fipc, xuser, datea, fiptm) 
                  values(schema.seq_tddr.nextval, old.fipc,'A', systimestamp, v_pr);
                  
                  select pidr
                    into v_pkdocid_r
                    from tddr 
                   where fiptm = v_pr; 
                  
                  insert into schema.tere(pidr, ferror, fidre, xuser, datea, fipcm) 
                  values(schema.seq_tere.nextval, v_fkerrorID, v_pkdocid_r, 'A', SYSTIMESTAMP, v_linerror);
                end if;              
              end if;
              --
  
END trg_CP;
/

But i'm getting:

PL/SQL: ORA-00984 on:

select pipm 
  into v_pr
  from schema.tpm
 where fipcm = v_linerror;

The problem is not on the select statement, I removed both selects after both ifs, and now it tells me that the column is not allowed on the if statement... if i remove both ifs, turns me back to error on select statements

The error is when i put this insert:

insert into schema.tddr(pidr, fipc, xuser, datea, fiptm) 

values(schema.seq_tddr.nextval, old.fipc,'A', systimestamp, v_pr);

after this select:

select pipm 

into v_pr

from schema.tpm

where fipcm = v_linerror;