To be honest if you are proficient with windows then you will have no problems using a mac
windows control panel = mac system preferences
windows explorer = mac finder
Best thing to do is turn it on a start playing. The apple website has a few good pointers for switching too.....
Most of all, enjoy!
Ideally I did not want to have to purchase one.
I want to learn about the file structure and file types.
ah well you see your original post said you wanted to learn the basics so one would assume you were looking to use one.....
Think you need to elaborate more when you say file types and structure?