How do I decide which legal form a start up business should be?
Here are the alternatives:
C-Corporation S-Corporation Sole Proprietorship Partnership LLP LLC
My personal preference is the LLC or limited liability corporation. You get the liability protection of a corporation without the paperwork required for a full corporation.
My suggestion is to go to Wikipedia and research each of the above alternatives. Then use the Decision Matrix to help you make a decision between the alternatives. You can put in factors that are important to you.