Good luck with the nuzlocke! I haven't done one of those yet but I've gone through several other challenges; they're very fun. There are a ton here in our Challenges board, which I see you've already found, so whoo. :D You should consider signing up for some more once you're able to as they really do make Pokemon so much more addicting to replay.
Welcome to the forum! Like HackDeoxys said, check out Emulation for anything related to ROM hacking. There are a lot of good resources to help you along your hacking journey and a lot of people to assist anytime. If you're confused about something in regards to hacking you should be able to ask in the simple questions thread over there. Good luck! Have a lovely time here and see you around.