Thanks for the help, Kitsu and Erico!
That thread and WackaAlpaca's video's have certainly helped me a lot.
But now I have some more questions.
I've been looking around the forums and saw the BrawlEx Clone Engine, which basically allows you to add new characters instead of replacing existing characters. Now since it's only compatible with NTSC, I can't use this. So I was wondering:
Are there any other methods for adding new characters?
And can the same be done with stages and music?

Thanks again, in advance!

Hello kitties!
Ever since I really got into Brawl, I've been seeing possible movesets for characters in all sorts of other media. This made me really want to get into creating my own characters, stages, music, trophies and events. My question here is:
Where do I get started with Brawl hacking/modding?

I personally own an unmodded PAL Wii and a PAL copy of SSBB, and I plan on keeping my Wii unmodded, and instead using Dolphin (with a PAL iso so that if I ever decide to mod my Wii I can be sure that the things I create will work). I also have Autodesk's 3DS Max 2012, but sadly I lack experience in it.
Can anyone direct me to some tutorials and/or tools that can help me get start off with Brawl hacking/modding?

Thanks in advance!