There's barely anyone who could give away his free time to teach you as it is really hard and can be frustrating. It's all done by practising, practising, and then practising some more.
But I'll just give you some basics on what to start:
GFX Frequently Asked Questions:
Tutorials - MPGH - MultiPlayer Game Hacking
General Photoshop Tools Using Tutorials:
tutvid's Channel - YouTube
Notice: If you really want to be a good signature maker, never, NEVER GIVE UP! You may think you'll never succeed but every good signature maker thought that and look where they got.
@Have-nameAlt Now, if you could PM me the CrossFire account...