simple test using PL/SQL procedure

I need to run a simple test using PL/SQL procedure.  please help....how to.

I have a huge table, doctor_info, with 6 columns, 350 million rows,

for a test I would like to do the following:

1. select 1000 rows at a time

2. insert 1000 rows into Doctor_info_new table with additional column - sysdate,

3. commit;

4. sleep for 5 minutes (execute dbms_lock.sleep(300);)

4. wake up and do above steps again until all rows are inserted.

5. exist when all rows in the original table has been completed.

Part of the procedure:

variables

     v_col_a        varchar2(25);

       v_col_b        char(1);

       v_col_c        varchar2(100);