Your water parameters look fine to me, in fact, better than average. Keeping your tank clean is more important than perfect water conditions. I presume you have a system in place to detoxify chlorine and chloramine? Until you add plants, lighting is strictly optional. In a bare bottom tank, lights are for the discus keeper rather than the discus.
Also, depending on where you live, the tap water would need to be de-aerated in the winter. So you would need it to go into a conditioning tank before going into the tank.
I strongly recommend you buy discus from the Simply Discus sponsors. They'll be cheaper than a local fish store and much higher quality. You'll also have recourse if the fish turns out to be low quality or not healthy.
Good luck, Willie