Hi Genga! Welcome to PC! It's fine if you were a little hesitant since this is a really big forum so joining and getting involved can be scary. I was afraid of this place for a long while so I can understand. But it's okay! We're all really friendly and love new peeps so you're in a good place here. n~n All you really need to remember is to keep posting around and not disappear since you'll get the best experience that way.
You'll be quite busy if you plan on trying out all the great hacks we have here, they're one of the biggest and most popular aspects of the forum. Which ones have you played so far? I need to get back into them again since it's been a while.. just been so lazy with playing and haven't even finished Ultra Violet yet, haha.
There are many boards to discuss anything Pokemon here though, ranging from forum games and clubs all the way to anime/manga discussions! I'm sure you'll find many things to do here and if you're confused, just ask a staff member! They wander around the forum with blue, orange, and red names. Have fun. <3