As long as you have an internet connection, you can get xbox live on a 360 or a slim.
No. You will need to register and buy Xbox live.
I personally would go with an Xbox 360 Slim. I would also recommend Xbox Live over PlayStation Network, even though PSN is free.
No Live is for Xbox 360
All editions of the Xbox require you to purchase the same memberships.
I am Pretty sure it will, As the slim is an upgrade form the lower 360 platform so as long as you have the update from xbox live you should be able to play doom 3 on the 360 slim
This was one of the things I was curious about when purchasing my new slim Xbox 360. You may know that with the older versions of the Xbox 360, it included a code inside the box which gave you a months free free trial of Xbox LIVE. However, this has changed with the newer slim consoles, including ones with Kinect. You are not given a code within the box, instead you are offered a one months free trial when creating an Xbox LIVE account on your new console. So, if you already have an Xbox LIVE account, you will not be given free Xbox Live when purchasing a Xbox 360 Slim. To get a free trial you will have to create a new account on your console, were it will be offered to you after declining a payment for Xbox LIVE gold membership.
No you dont, you have to pay like everyone else.
i think you do whenever you activate everything.
All editions of the Xbox 360 require you to purchase the same memberships.
Yes it does and its brings its hard drive hidden inside it and 3 months of Xbox live .
Buy a wireless router. Buy an Xbox 360 Wireless Adaptor if you have the old xbox, but dont if have the slim one. Go to "Join Xbox Live" in your Xbox 360 Guide (Press the xbox logo on your controller). Follow the on-screen instructions.