I'm going to recommend a book for you. http://www.amazon.com/Business-Legal-Primer-Game-Development/dp/1584504927
I learned quite a bit from reading this book, and it also gives you some realistic expectations on the gaming biz. It even has a few articles from veteran devs like Ralph Baer talking about things they wish they would have known ahead of time. If you don't have the cash for lawyer off hand, this book can save you a bit of trouble (depending on how far you want to go).
Tbh, I don't remember the book being so pricey. I got it for about $50 USD (IIRC).
Also, are you a programmer of any sort?
Shogun.