Premiere CS3 tech question

[mswyrr]

I recently tried making my own project settings in Premiere using a guide someone made -- but it came out very wrong and I've been wary of it since. But I think the time has come to try again -- I'm dealing with source that's 23 fps and the lowest pre-set Premiere offers is 25 fps. I was silly and tried to go ahead anyway, but exported video isn't clean and pretty as I'd like it. I'm going to try to make a project specs specific to my source and I'd love it if any of you have advice or guides on how that's done. The source for this project is 576x320 and 23 frames/second.