What do you mean with “create Page”? It’s a physical data file or just a data entry in TEXT-Column of a database-table?
If you mean a physical file on the server, the piece of advice by RvR will be right. But if your target is a kind of Content-Management-System, you should add a column to your database-table to store the user_id. Than you can create a scope with param to select just the pages which the user has created.