New to DND and Play By Post
Howdy....D&D is a decent game. they have changed the rules over the years to sell more books and steal some great ideas from other systems.
You can find games here, by looking at 'players wanted" thread , and By using the Customizable search engine at the lower part of your main page.
there are some great D&D games on this site, so if you find one lookign for players, Let the GM know you are new to the system, some of them may have links to D&D stuff on line that you can check out,
You can always ask questions in the forumns, if a Mod can't answer, a player should be able to. Have fun!