so where about do I make the advanced settings to my video, such as the AA and AF?

I'm wandering what options I can enable so that I have an outstanding looking game. I'm talking 1680 * 1050, etc...

System Specs:

AMD Athlon 64 X2 6000+ @ 3.0GHz
Corsair XMS 2GB DDR 800
Evga 8800GT SuperClock 512MB
ASUS Crosshair Motherboard
Creative Labs Sound Blaster X-Fi Extreme Music
Western Digital 250GB SATA HDD
Samsung 226BW 22" Widescreen @ 2ms Responce Time
Razer DeathAdder Mouse w/ Razer Exact Mat

Thanks

Im not sure how to apply a skin, and where to put the skin at. Can someone please help me out. Sorry just got this game yesterday. Thanks