I need help reading music for piano! Please?!?

Okay so for a long time I've been fascinated by instrumental music, mainly piano and violins. So recently I've tried learning to play my key board. I can read the staff and tell what's what, but I can't decipher which keys are what on the staff. I mean like C, I know where that's at on the staff but I don't know which key it is on piano. Can someone please tell me how or give me advice?