I think it's great that you want to get a dog for all of you, and I'm excited for you!
Just to clarify, I never thought you'd be keeping the dog outside all the time!
What I was trying to say was that I don't think that the run in the back yard by itself will be sufficient exercise for a young, working type dog (if that's what you get), who will still get bored out there if alone (and take to barking, digging, fence running, etc., all things that are a "job" he can do if you don't give him a better one!).
Dogs like this do best with hard daily exercise with a purpose - running, playing, exploring, swimming, etc.
Dogs who work and play hard, SLEEP hard when they get home, and therefore stay out of trouble.
Dogs who haven't had an opportunity to let out that energy that gets pent up (which is instinctive and they don't know what else to do with) find other ways, and their ways aren't generally going to be acceptable to you - chewing sofas, shoes, toilet paper (inside); and the ones I mentioned above outside, etc.
People say well put them in a crate and they won't cause problems. That's all fine and good, but it still means you have a dog who NEEDS to release energy somehow! The thing is, if you want a balanced dog, you really have to help him channel that energy the way YOU want it. So somewhere in the day, every day, the young, working-type dog needs/does BEST with hard exercise.
More:
http://www.vetstreet.com/our-pet-experts/your-dog-why-exercise-is-important
https://www.chewy.com/petcentral/health-pet-fitness-8-reasons-your-dog-needs-exercise/
Explore dog parks around you. It's nice when they can play with other dogs off-leash.
Dogs also love walks in the woods and on beaches, at parks, on city streets, etc.
The run is fine for pottying and staying out for short periods. Just make sure the dog does not have a choker-type collar on when he goes on it as he could inadvertently strangle himself. Just use a regular properly-fit collar.