As for the first question, you will get one of 3 Dishes (or dish combos). A Dish 1000.2 receives 110, 119, and 129 (the last one being where much of the HD is located). It can power 3 dual tuner receivers by itself. If you are in the East, rather than 129, you could get a Dish 500, with 110 and 119, plus a second dish for 61.5, which is mainly a mirror of 129. This can power 2 dual tuner receivers. Starting Aug. 20, Dish is launching the Eastern Arc, which will have one dish receiving 61.5, plus 72.7 and 77 (called the 1000.4 dish), which will be MPEG-4 encoded mirrors of what is on 110 and 119. This can do 3 dual tuner receivers. However, it is only available in 20 DMAs in the Eastern half of the country starting 8/20.
Not sure about the second question.
Not sure about the second question.