New to D20 Pro Looking for game

Hello,
I'm new to the whole D20 gaming in general. AGES ago I had a DnD set and played it but I'm not even sure if I did things right. That also was like a decade ago lol. So without having to actually find a place and drag people to that place I figured the online route was the way to go to pick things back up! I'm a quick study and interested in making my own maps/scenarios (eventually). Right now I am currently looking for a game to get into to better learn the interface of this program as well as game mechanics. THANKS!