Hi Mkgerry and welcome to Android Forums!
The gmail account on the phone would be the one that you want to link to for all apps and backup on your DEVICE. This account will follow you forever... as you upgrade phones, log in with that same account and all your apps will download again.
It doesn't necessarily have to be your main e-mail account, but it does have to be your phone account. If you had a previous Android phone, use the gmail and password that the phone was set up with. Otherwise, you can create an account fresh and hae a new start with your Note 2.
You can also spend some time in the Note 2 forum here:
Samsung Galaxy Note 2 - Android Forums
That way you can get your questions answered and learn to master your new device.
Again, great to have you aboard!