Ceating table using PL/SQL procedure?

Hello.
I need to run a process (in Oracle) which creates some tables according to some specific logic. Before creating those tables I would like to check if it already exists and if it does - to drop it.
(when trying to do it I got an error : 'ORA-01031' insufficient privileses)
I was reading some forums on the net and I understand that it is a bad practise to create tables from Procedures in Oracle.
Please advice which other option I have.
Thanks!

Thans for your responses.
Example of what I need:
create table TABLE1 as select * from
SELECT TABLE1.x, TABLE2.y
FROM TABLE1
INNER JOIN TABLE2 ON TABLE1.X=TABLE2.X
... (it's just a short example. the query i use i much longer and more difficult).
I need to create ~10 tables on the same manner.
It has to be a kind of daily process. But if by mistake this table was previously deleted - I will get an error when dropping it. That's why I need to use a kind of condition in order to check this.
Please let me know which alternatives I have.
Thanks.

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