Roof replacement on camper with fiberglass exterior

Over the weekend I removed the old EPDM and repaired the damaged portion of the roof. Not too bad so the next step is to install a new roof.

Where is the best place to buy EPDM and the other things I'll need to install it, like the adhesive?

Since the old roof was installed with adhesive, most of the roof remains very sticky. And of course, I pulled bits of the old OSB off with the old roof. What should I use to smooth out the existing wood deck so I have a suitable surface for the new EPDM?