Make sure they rap the house and you should tape all the joints and gaps around the windows and doors before the siding goes on. It makes a huge difference when the winter wind starts blowing. Most contractors are more concerned with getting it done as fast as possible . So its up to you the do the little things like sealing gaps in the framing and placement of furnace , hot water heater ducts and plumbing so you can finish the basement or other areas later. Have them add outlets in the garage most code only requires 1 so that is what you get.