well you either need to buy an ethernet cable to run from your xbox 360 into your router/modem. If your router is to far away and you have wireless you can buy a wireless network adapter for around $50 off eBay
as far as i know there is no longer xbox live for the original xbox if you want xbox live you have to get a 360 this is how Microsoft screwed over alot of people
1. buy a wireless device or use your ethernet cable and plug it into your internet box. 2. Enter all your details (E-Mail and all that) and that's all it really is to it. 2 easy steps! p.s my wirless...
1st you must have internet (wireless is optional) you can go wireless and pay the $50 for the adapter or go ethernet.2nd you must test your xbox internet connection and make sure it is working...