I'm afraid I don't know anything about V bulletin, but as for Moodle I'd suggest you download it onto your own computer and practice being an administrator on a local version. I'm just a teacher and I didn't find it very difficult. I just use the bits I need and add others as I go along. You find it at http://download.moodle.org/windows/ and documentation about this package in Moodle Docs.
To run a course you have to have Moodle hosted on a server somewhere. There are free ones but you have to set it up yourself or pay/get someone else to do so. That's the bit that's too techie for me. I'm an administrator for a small association and we pay for hosting.
Many of our users are not used to the Internet and need a lot of hand-holding to understand about how to log on the first time: passwords, usernames, confirmation emails, etc. but I think you would have the same problem with any system that is password protected. I've had to write step-by-step tutorials with screenshots to help them.