New GM (Help needed!)

Hey guys, so i'm looking for some information that's been kind of hard to come by.  I'm looking to become a GM for myself and 5 friends, i've been looking for websites and galleries for decent maps that i might be able to use.  I'm also looking for models, (Examples, Vampires, Monsters, Dragons) And so on that i might be able to put into my game. Does anyone happen to have websites i might be able to use? I had a friend years ago that used Roll20 and had amazing maps and dragon models and such he could put in, but i don't know where he managed to get them all. (No longer friends so i can't ask him sadly.) Thanks in advance everyone!

Marketplace would be where to start. I'd suggest on not being stingy and just pay 10-15$ for some good map packs. I realize not everyone is made of money but if you want a quality experience you'll have to shell out some money; maybe just get a few bucks from your buddies to pay for the module. Also the prices just went down in the store and the roll20 compendium is really awesome; I'm not getting paid by roll20 to say this but I am trying to support the amazing artists in the store. If you have questions on how some of the marketplace items work (I've spent a small fortune on these packs) I can give you a few good ones to start.

Ahh okay! Are they're any map packs that you'd suggest buying? Thanks again :D