Disc brakes are not hard to set up (per se) There are two bolts holding the caliper to the mounting bracket on either the fork or the rear triangle.
If a wheel is rubbing against the brake and it's not rolling correctly then simply loosen the two bolts a little to where you can wiggle the caliper around and then reposition and retighten.
As easy as it sounds, it can be a bit of an art form getting it right. The caliper likes to move on you a lot. I usually start with the bolt closes to the rotor, get it in place and then try and tighten the other one down. Sometimes I get it the first try, sometimes it takes about 10 minutes of absolute frustration.
Then again, it could be the hub that's the problem. Regardless, neither of these issues is rocket science and you don't have to be a spectacular mechanic to diagnose if a wheel is not rolling as it should, what the cause is and fix it (unless mechanically there is an issue, like a bearing that's toast, but on a new wheel I hardly think that would be the case.)