Search for your state Secretary of State office and look for business startup information. most states you can file a business name either as a corportation of various types, Limited Liability Company (LLC), partnership, or Doing Business As (DBA) name for a proprietorship. Most states charge less than $500 and it protects you in that state. To protect your name nationwide, you need to file a trademark with the US Patent and Trademark office listed in another reply.