Hey Otakugirl, welcome to PC!
I also joined to learn to do some ROM hacking, and PC really is a great resource for it!
I found Pokecommunity complicated (and a little intimidating) at first, but everyone here is so friendly, and after a while it becomes so easy to navigate.
As Cirno says, be sure to check out the Emulation section, if you either need help or want to check out other peoples' hacks.
3rd gen is my favourite, so like me, you might want to check out the Advance Gaming section.
Anyways, I hope your ROM hacks go well, like Cirno, I would love to hear your progress, welcome to PC and I hope you enjoy your stay!