[sebandr]

Start by looking over the documentation on YC's site - a lot of great free legal docs and frameworks to use. Most of this would cost you a ton if you went to a lawyer directly.

The choice between LLC and Corp. depends on your business and tax status. Cost is a lot less for LLC, and also a lot less of a pain to do - taxwise it's also simpler. Corporation has other advantages because it's a separate entity that comes in handy to shield yourself from some personal liabilities. Again, it depends on what you're doing.

Incorporation depends on your needs - many choose delaware - they make it easy and cheap but there are hidden issues. Alternatively you can incorporate in your state - in California it's a bit more expensive but a clean process.

I'm not a lawyer but I've done several start ups so some of this comes from my own experience.