I still can't figure out the newer iTunes App

I went from iTunes 5+ to 12+ in one afternoon and
haven't been able to do a thing with it ever since

QUESTION: How do I add Ted's iPhone to iTunes
..so I can add apps like a GPS etc.?

He has his own (apple@me) e-Mail account
is that's what's required? if so, how do I link
his iPhone to My Apple.Mini/iTunes account?

The least confusing thing would be to make a separate account on the computer for him and use that so his stuff is separate.

https://support.apple.com/kb/PH21994?locale=en_US

Here's a solution, this is your scenario exactly. A different iTunes library for each of you, then your stuff won't mix in with each other.

If you want to use any music that's in your iTunes library you'll have to import it into his since you'll both have your own space.

http://www.imore.com/how-use-multiple-apple-ids-one-computer-and-itunes

When you want to switch libraries you just have to Quit iTunes and relaunch while holding Option to choose the Library.