1. Yes, You need a webhost. Most that ive been looking at (im also interested in a domain). thatll cost ya a little bit of money.
2. Most places will let you install phpBB or vbulletin or something on it. Theres a wordpress plugin that lets you add pages that link to other places.
3. wordpress.com is severely crippled, they want you to pay for everything. If you get a domain, youll also have to get the real wordpress, which is completely un-crippled and you can do anything you want.
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