Hey there! New to play by post!
In reply to Iamjacks000 (msg # 1):
You ought to be able to find some here. D&D 5th Edition is a popular system hereabouts.
Being new, it might be worth your time to hang out in Community Chat a while and get a feel for the place. While you copy the traffic there, don't neglect the Help and FAQs, as there is a definite culture and etiquette here.
When you're ready for a game, look at Wanted - Players and Wanted - GMs. These are advertising boards for games. Wanted - Players is a place where GMs advertise for players in existing games, and Wanted - GMs is for players to advertise for a GM to run a game they want to play.
Game Proposals, Input, and Advice is a place for GMs and players alike to solicit feedback, advice, and guidance on a wide range of game-related topics. It also serves another purpose, though: GMs considering developing a game on RPoL can post here to gauge interest before doing all the work needed to field that game. Following interest check (IC) threads is a great way to get in on the ground floor of a game just starting up.
That ought to get you started off on the right foot. Don't be afraid to ask questions, and to just dive in and get you some of this fun we're all having.
Welcome to the fray!