UBB.threads PHP Forum Software Community Forums UBB.threads 6 Version 6 Support Major Newbie looking for help

I hope someone can help me as I have zero experience with forums. I have opportunity to take over forum that is using UBB.threads™ 6.4.4. I had to do a Yahoo search on UBB 6.4.4 just to learn what it is, as my computer experience is as user only.

Best way to tackle this is list questions, I apologize in advance if I break any protocol:)

1. How easy is it to learn to host and manage UBB.threads™ 6.4.4 forum for a complete novice?

2. Where (how) do I start learning to work with the software?

3. How much experience do I or should I have before attempting to run forum?

4. How hard is it to upgrade to newest version? I think I saw UBB can do the upgrade for under $200?

5. Is there downside to upgrading?

6. Is there learning guidance either written or on CD/DVD?

Thank you in advance.