What is it now? First person or third person?
If you want to make a first person shooter, I would recommend you Grimber's first person tutorials (AUM resources), but unfortunaly they're in c-script. But the ideas and systems are clear, and they are easily transportable.
If you want to make a third person shooter, well... That might be more difficult, so I'd start with first person; In third person, you have to care about bone rotations, camera collision, entity attachement... if you never did a shooting game before, that could be too much for the beginning.