I'm not sure on this one, i will try and find out for you.
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You can only play online for free with a PS3 or xbox360 or a wii. So make an account go to your call of duty game and go to multiplayer go to online connect and there you go your on online mode
You may create your own class in call of duty, by entering the main menu of Call of Duty 4 Multiplayer. Then you click the title showing 'create a class'.
The best one would have to be Call of Duty 3 on PlayStation 2. Yes you can go online on it.
All of the newer call of duty games can be played online. I've been playing since Call of Duty 4, and they are making Call of Duty 8 right now, and all have been online enabled.
yes, call of duty world at war has online. you go into multiplayer and click play online.