I can't even begin to tell you how helpful this blog post on Quicksprout by guest blogger and attorney Scott Walker is about the differences between LLC, S-corp, C-corp are.  I have been through this conversation MANY times and still find myself questioning the right structure.  In addition to protecting your ass, choosing the right structure can have implications on partnerships, taxes, raising capital and liquidity events. 

If you have any questions or concerns, PAY SOMEONE WHO KNOWS.  Once you have chosen your corporate structure, an easy and cost effective way to setup the entity is through an online filing company like Filings Made Easy.