It's being delivered on Thursday and I would like to know what to do and how to do it (this is my first Mac).
Really, really, really explore the customisation options. Look at all the System Preference panes. Look at "Customise Toolbar" in every app on the machine. Open the Preferences window in every app.
Experiment with all the options to get it like YOU want it.
After using your Mac for a week do it again.
If there is something you can't get to work like you want, Google it, you won't be the first, and there is almost certainly an Apple way of doing it, or a third party solution.
I have friends and relatives who have switched to Macs, who have not done this. Months, even years later, I show them something really simple on their machine, and they say Wow, I wish I had known....
Only other thing I would say is not mac specific, but get your back up regime sorted...Time Machine is amazing, but you might want to have bootable clone too,