First and foremost, welcome aboard the nut train!
That's a tough questions, really depends on what you want to do.
There are some websites out there, some packs, scripts, art. There's people doing a wonderfull work around the web with FPSC in mind, not many, but some quite good.
FPSPack is a must in my opinion and it's free as far as I know. When it comes to art, there's some stuff around in the media forum and some paid (and good) stuff here and there. Regarding scripts, pretty much everything is in the script forum, just look around with an open eye for Merranvo posts
I just asked him for a script that serves me coffee and I bet he can do it.
What do you have in mind, it would be easier to help you if you have an idea what you are going to do, but my best advice right now is to do some testing with the actual art included in the game and when you decide about the first "real" one, start looking for art.
Good luck! and a Happy New Year!
I'm pretty sure I know everything. Doubts are something rare in me and I am never wrong, as this signature can prove.