Hi, I am providing services regarding company registration ( LLC) in US. if you are willing I will do for you. According to your requirements, I will put two points, if you are looking for tax free state, I will suggest you "Wyoming", its filling fee is 110$ or if you want least filing fee I will suggest "new Mexico" having 55$ articles of Organization filing fee. this is lowest fee of in all 52 states.
I will provide these documents:
1) article of Organization
2) good standing certificate
3) certificate of formation