A question for Prior Service Recruitment?

I seperated from the Marines about a year ago with an RE-1A code. I'd like to get back into the service. What i'd like to know is, what steps do i need to take to get back in, and how long will it take to run through the process? And is it possible to lat move or will i have to remain in my MOS? If so, would my cutting score zero out or will i maintain my current score. Grateful for any advice