He will be held to the same standard that Obama was held to with his promise that if you like your health plan, you can keep your health plan.
Trump will not build a wall, at least a physical wall that extends along the entire Mexican border. Nor will he deport 12 million people. I doubt that too many that voted for him actually will expect it. But I would expect him to be more vigorous about deporting those caught breaking the law, and will be less willing to release newly caught illegal aliens on their own recognizance.
Of much more importance will be the first Supreme Court nominee to replace Scalia, which he will do almost immediately. His choice will probably set the stage for the rest of his term. The next thing will be how complete will be his cancelling of many of Obama's executive orders that have been so vexing in the areas of immigration and healthcare. This is something he can do immediately, and how quickly he does it and how thorough he is about it will be closely watched by many of his supporters.
I expect the first big battle will be over the repatriation of profits held overseas. This is not something he can do without Congress, and there will be great resistance among Democrats in the Senate. It should be a good test of whether or not he can be a leader, as well as a demagogue. One promising thing today is the statements by many Republicans that they intend to do things piecemeal rather than with one large omnibus bill. The larger the bill, the more tradeoffs and bribes that water down the bill to uselessness.
The greatest danger, of course, is how he will deal with things like tariffs and imports. Hopefully, he will not do too much damage to the economy, or that the repatriation of foreign profits more than off set or mitigate the damage.