www.pokerinreno.com is a good spot to start. About the only place worth playing are the Peppermill and ElDorado (downtown).
http://peppermillreno.com/gaming/poker
http://www.eldoradoreno.com/casino/poker.aspx
Those have the basics for the tournaments and stuff. The Atlantis isn't bad either, quite small so the turnouts won't be huge, but can be fun too.