Well first things first, welcome to the site! You've already made a welcome thread I see...might be a good idea to brush up on the rules here so you don't make any newbie mistakes. After you do that, just find a section that catches your interest. :) If you like Pokemon, there's always the Black/White forum, PGC (which covers all generations of gaming), and Pokemon General. And judging by your username, I guess you like Bowser from the Mario series. You could check and see if there's a Super Mario Bros. discussion in the Video Gaming forum. And if there isn't, you should make one. :D
Aaaand, there are also other new members in the New Users Hangout thread in the New Users/Welcome section. -wipes forehead- That's a mouthful. XD Hope you caught all that, though. :P