Have you tried Google? Wonderful tool.
Anyway, here's what I found for two of your questions, see if they help:
#1: http://www.godaddy.com/
#3: http://www.phpbb.com/
These look like what you want, I haven't used them myself but they're both widely used. Just remember this: domains always cost, but forums only sometimes do, depending on the system you're using. The one I linked you to is free, but others like vBulletin cost.
Hope that helps!
Anyway, here's what I found for two of your questions, see if they help:
#1: http://www.godaddy.com/
#3: http://www.phpbb.com/
These look like what you want, I haven't used them myself but they're both widely used. Just remember this: domains always cost, but forums only sometimes do, depending on the system you're using. The one I linked you to is free, but others like vBulletin cost.
Hope that helps!