Very easy, go to a lwayer, pile the files and recruiting letters

Since you got faculty position, it's no problems to get approved.
You should contact a lawyer ASAP (you also can do it by yourself, I did by myself before), but if your time is pressing, and you didn't have such info., go to lawyer. Recruiting letters takes time, you have to push the people to write letters.
When you file the 0-1, you can pay 1000 to speed up and get approved in 10 days. Good luck