Testing multiple queries from input file
It looks like you need to write dynamic SQL. Dynamic SQL is SQL the creates SQL that can get run. Here is a simple example of dynamic SQL.

SELECT 'ALTER ' ||
       CASE object_type 
       WHEN 'PACKAGE BODY' THEN 'PACKAGE '
       WHEN 'TYPE BODY'    THEN 'TYPE '
       ELSE object_type ||' '
       END || owner ||'.' || object_name ||' '||
       CASE object_type 
       WHEN 'PACKAGE BODY' THEN 'COMPILE BODY;'
       WHEN 'TYPE BODY'    THEN 'COMPILE BODY;'
       ELSE 'COMPILE;'
       END text
  FROM dba_objects
 WHERE status = 'INVALID'
 ORDER BY 1;


You should also have formatting in the SQL to keep the output of the SQL as clean as possible.

SET TERM      OFF
COLUMN text FORMAT A150
SET ECHO      OFF
SET TRIMSPOOL ON
SET TAB       OFF
SET FEEDBACK  OFF
SET PAGESIZE  0
SET LINESIZE  150
SET TIMING    OFF
SET TERM      ON


Then you just need to write the SQL that generates SQL, if you need to connect as a different user you can include a line like:

SELECT 'CONNECT user1/cdjkfghljsdg@sidname' text from dual;

But you need to figure out how to write the SQL, since you have not given many details.
You will spool to a file, then turn on feedback, set pagesize 50 or so, probably set timing on etc, then run the output of the spool file. You may want to spool to a log file during the run phase. There are alot of examples, you just need to query for an example that matches what you want to do.