I have an open table dungeon crawling campaign of Basic Fantasy RPG . It is a free game that is like early D&D and AD&D, but also takes a few things like Ascending AC and Attack Bonus for simplicity from "d20" games like the ones you like. New Players are regularly welcomed in my game. More than a dozen people new to Roleplaying Games or just new to Roll20 have made characters and played game sessions in this group so far. You can PM me and request the Link to join, which you can share with your friends. Once in the campaign we can dialog to set up an exclusive time for your group to make characters together with me & run an introductory dungeon. PM me asking about Basic, if you are interested. My campaign title is "Explore dungeons inside a strange world!" Cheers.