ok i bought an alarm (as the stock one has been disabled and im pretty sure the main box has been removed). The alarm wiring diagram says that i need to connect it to the box that controls my central locking (central locking works with the key even though alarm is disabked). can anyone tell me where the box that controls the central locking is located?

thanks in advance

Everything you need to know is in the FAQ.

Alarm Install

woops, i thought i forgot something, the search button

can anyone tell me which way i should wire up the alarm?

Yes. Pay a professional to do it. Alarm install is really really hard to do, extremely complicated, and you run the risk of seriously screwing up your electrical system. The hundred bucks you spend to have it installed is well worth saving yourself a minimum of 6 hours of pure hell. And that's if it goes well. It's just not something that's for the novice.