Just go under a bridge or something, nice places to practice... Walls of old factories. And the classic : wagons.
If you are just starting, don't think about it, just take a part of a word, like 3-4 letters, and just graff it. or draw simple things, so you find what your style is.
Graffing is not always about talent, its about finidng your style. I know graffers who suck at drawing and they still manage to do some awesome graffs non the less.
I tag a lot in europe though, but I did a few graphs.