Well for starters just search for them
Second texture hacking isnt exactly difficult just exract the textures with brawlbox edit them with paint or photoshop and replace the old texture using brawlbox and save
Vertex hacking on the other hand is more difficult it took me bout 2 days did get the hang of it go here for the in my opinion easiest form of vertex modding
http://forums.kc-mm.com/index.php?topic=13061.0And for psa modding go here
http://forums.kc-mm.com/index.php?topic=1096.0