How is an Nurse Agency Created? What is the best current travel agency out there?

I want to form my own Nurse Staffing agency. Have you created one, checked into it, know someone who has? Any info on what it takes please let me know. I know of people who have. What state, accounting and legal process do I start?

Who is the highest paying and well networked (high job availability) travel agency that staffs in the Northwest and Northeast?