Trump will be able to do a lot with executive orders, those "checks and balances" aren't as strong as they used to be. Obama had a Democratic House and a Democratic supermajority in the Senate and still struggled to pass a crappy, watered-down health care bill somewhere to the right of Richard Nixon's proposals, but part of that may be because he started out with wild ideas about reduciing partisanship.
Trump doesn't seem to know or care much about the actual mechanics of governing so I think how much he actually get done will depend on what kind of Cheneys he surrounds himself with and with people like Roger Stone and Newt Gingrich on board, the signs are not good.
If I was setting the questions for the next debate, one of them might be: "Mr. Trump, can you explain how a bill becomes a law?"