yes u can buy the 3 map packs either in a bundle with all of them or seperet but it cost Microsoft points.
As long as your xbox 360 is connected to the internet and you have xbox live GOLD membership then yes you can play on xbox live with call of duty
You have to have Xbox Live if you have an Xbox
it depends where you get it
If you do not have Xbox live, there is no need to have Call of Duty Elite. The COD Elite gives you a huge data profile about your online stats, matches etc. If you do not have xbox live, there are no stats to gather. The Call of Duty Elite will have a yearly cost, this will be a separate payment from Xbox live.
No, you can not download maps for call of duty five without being on xbox live.
yes
escalation is out for xbox and ps3 get it soon
There is no call of duty 6. call of duty six is black ops.
No, you don't. But you do have to have Xbox Live in order to get the map pack.
yes
Call of duty 4 Call of duty world at war Halo 2
No, the updates require a connection and Xbox live.