Welcome aboard the fast train to poverty and destitution!! Reps will do that to you, you start with one and first thing you know, you look around and you are neck deep in watches!! looks like you have a good head start with 32 watches already.
As Freddy and Mike said, you have to read, read and read more. Narrow down your interest area, at least at first and then decide what specific watches you are interested in. When you decide that. you can choose a dealer, based on his reviews, your comfort zone with the dealer (Does he accept a watch back if it's DOA, what are his replacement policies if the watch is lost stolen or seized by customs, what are his payment methods, etc.?) All of this will play a part in who you feel comfortable dealing with. Then it's just a matter of finding a second or third job to pay for this watch obsession, sending off the money and waiting for the postman. Good luck