Any idea on how many page hits/day or hits per month? That and average page size. Should be able to get an estimate on bandwidth usage that way.
Or is this something completely new?
Completely new although I have hosting something very similar before hand, we had around 2k members which visited on a regular basis, I would probably say between 300-500 hits per day and I'm not to sure on the page size its the forum that will be used the most.
There should be a ton of hosts offering this. Be careful where you look, in the hosting industry, cheap really does mean cheap! They work on volume and not quality. As far as the "free" domain, read the fine print, while it seems like a great deal, you can usually get a domain name at a third party registrar for $10! There have been horror stories of hosts playing hard to get when it comes to moving to another host, and allowing you to take your domain with you! (i've had to help a ton of clients to get their domain moved) Good luck!
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Yes, web hosting plan features and the type of supports that you might receive are some of the important factors to consider when finding a good hosting provider.
Free domain name have its own disadvantages where some host lock the domain name or you only have the domain as long as you hosted your website with them.