Take a course at your local community college if you want to learn some admin. Still, if you are not familiar with the OS you are using, not good. I would never use Windows personally, but, I also wouldn't use a system I know nothing about.

You could also scale back a little to a shared hosting service so that you do not have to admin the site. Shared hosting can be a good thing. Most sites do not need a dedicated, or even virtual dedicated server.