How to move up from AB to 3rd Mate Unlimited

Hey guys I’m trying to get my first license but i’m getting mixed answers, can anyone tell me the right process to upgrade from AB to 3rd mate unlimited. What courses would I need and what’s the process like, I have to proper sea time so its just a matter of what steps to take.

Thanks for your input.

http://www.uscg.mil/nmc/