Microsoft Project Pro 2002 and Microsoft Project Server 2002 are two separate products.
Project Pro is the client application which will connect to Microsoft Project Server. Project Server will ONLY use SQL Server for its database on the backend. Oracle, DB2, Access etc can NOT be used. Entering the data directly to the SQL server database is NOT an option. The Project Server database is not a simple database to understand and entering data correctly across all the necessary tables is a huge undertaking. You are much better off using import features of Project Pro. Once you get the data there, its just a matter of saving/publishing your new project schedule to the server.
To answer your question: Using Project Pro, you can use the import wizard to import data from Excel files, older version of Project, comma delimited files etc. I would recommend dumping your data to a comma delimited or Excel spreadsheet file and then using the File|Open menu, choose your file type, and the wizard will appear to walk you through. You'll need your task information, resource information, actuals etc and match the fields up.
If you're looking for a data integration solution between your timesheet app and Project Server, a custom app/script would need to be created to follow the proper security and interface requirements of Project Server. Not an impossible thing, but something that would definitely take some development effort.
David Livingston
david@davidliv.com