I hate to break this to you, but one of the reasons that there is so much concern about Trump as the nominee for the GOP is that Hillary winning by 7-8 points could lead to an annihilation in the Senate and the House. So it might not be Paul Ryan calling the shots. even if the House did not turn, the Senate is much more likely, and that is where impeachment is tried (or, not really tried, as occurred in 1999.)
You are off by the facts that the election is in November 2016 and a new President is not sworn in until January 2017.
I hate to break it to you, but you really need to read up on the Constitution of the US.