Hi Paul! Welcome to the group!
Sounds like you need help getting started with selecting a domicile state and a mail service. There are many options and reasons for selecting one over the other. I would start out be reading Technomadia's post on Picking a Domicile State. That will show you several of the options and will probably spark new questions :)
I personally use Texas as my domicile state, and the Escapees Mail Service for all of my mail. Easy, convenient, and cheap. All good things to me :)
Do some reading and post up if you have any questions!
--kev