I'm only helping you because i was in the same situation and i know it's very bad.
This is what you need:
- crossover cable (or system link cable)
- Flash FXP to connect your computer to the xbox
- super ppf
- Microsoft Framework (just google it)
- Encryptomatic Signature
- Multiplayer map pack
Go to this wb site, I think you can find everything there, except the crossover and th map pack
When you have this tools tell me something.