Welcome to the site!
I wouldn't worry about making any mistakes on here if you're here to learn more about the Ubuntu OS. I know that we have a few Linux driven members that would be able to answer many questions that you may have. (I'm taking Linux OS course next term so I'll be more helpful with linux then
I would also make an account over at ubuntuforums.org. This site is where the developers hang out for Ubuntu and are very helpful with some of the more challenging problems you may run into (not to discredit any of our members!!). The downside of ubuntuforums would be the social lounge there also seems to be riddled with Ubuntu issues and there's no real hardware (outside of OS issues) support.
Humans are the only creatures that won't live up to the their potential. Give everything your all. When you die, die on E.
So I ask you, what do you intend to do now?