Welcome to the community, we're glad to have you! Best thing you can do is look through the listings for a game that is looking for more players on a day and time you can play. Don't forget to put in the Edition of D&D you want to play, and look at games accepting new players. Alternatively, if you can't find a game, try running your own! There are always more players than Dungeon Masters, and once you start DMing games it's hard to stop. You don't need to have years of experience playing or running games to start one here on Roll20, though it does help.