I'm a bit nervous, because while I'm not new to roleplaying in general, I'm new to dice-based RPing, and the super detailed character sheets that usually come with. I hope to get confortable with the concept quickly, as I promise I'm a fast learner, and good at making decently long posts. I'm definitely not the type to GM, I'm much more of a player. I like genres associated with fantasy, medieval life, and adventure, though I'd like to try out the punk genres as well(especially steampunk).

Hey, welcome aboard!

There are plenty of freeform roleplaying games here, you don't have to make the jump to dice-based RPGs if you don't want to.

But, play-by-post roleplaying is kind of like an IV-drip of RP.  You'll have plenty of time, usually, to read up and understand what dice you need to roll and why.

You should see two forums in your list, "Wanted - Players" and "Wanted - GMs".

The players wanted is where GMs list their games needing players.  Browse, find games that interest you, pop over to the game, and you should see a "request access" link, which will allow you to message the GM of the game, you can ask to join there.

"Wanted - GMs" is where you go to request a game, if you can't find what you want in "Wanted - Players".  It is pretty self-explanatory.