Work out the pace per mile from that, and that's your 10k pace.
I'd then roughly, equate easy pace to be about 90secs minimum slower, but up to 2mins slower. That'd be the pace you do your long runs, or extra weekly mileage at.
You could perhaps then do intervals of a mile or so at your "10k pace", or shorter reps faster than this (with recoveries between 60-90seconds) , and tempos (continuous runs of say 4-6miles) at say 30secs or so slower than the 10k pace.
That's a rough guide on paces.
Check out the McMillan race calculator on google, that will give you more specifics.
A motorised treadmill does some of the work, there's no weather conditions or air resistance to deal with, and you run in a different way to how you would naturally on the road.
Take your point about mental resistance, but trust me, there's enough need for discipline in running as it is, without adding more strain to the mix!
Generally though, a nice training plan long term is a long run, some reps of short distance followed by recoveries, and a continuous "tempo" run. Then slotting as much easy running in as you can handle.
Gradual build up, create a base fitness, then slowly add in the quality work.
To a point, the more mileage the better. Simple as.