Trump plays the bully, the bad boy, and may be personally someone many of us would hate, but he is not a solid ideological Republican. He hijacked the party machinery to get elected. He is an authoritarian, but not a fascist. He is reality teevee star, and a brand promoter.
The Republican party with all its resources is not behind Trump the way they'd be behind Jeb! or were behind the Georges. And he is similarly not loyal to the party. Thus he cannot simply draw from the deep Republican bench in order to populate his administration.
So instead of the incoming cabinet and crew being composed of experienced party loyalists...
(And what a sham the two party system is. Not that there aren't differences, and real consequences of electing one or the other, but neither party can stay out of the war business or give us or even want to give us national health care, the former because of the deep state and war industry influence, the latter because of insurance, pharmaceutical, and medical machinery industry influence. Money rules both parties.)
...this time we'll get a cabinet and crew full of those who usually only do the buying, and thus know little about government or governing, along with some Republican lackeys who have signaled or demonstrated loyalty to Trump personally. Oh, and some retired generals. They will probably not be particularly effective.
That's one difference. Here's another:
The deep state is not with Trump. Some of them are-- most in the FBI, for instance-- but he isn't a "business as usual" president in the sense of "can be told what to do" by it.
That is unprecedented in recent history. It's kind of a big deal, and not bad. It might even mean less war. He won't want the complications, the distractions, or the risk of failure. It could also mean they'll continue to maneuver against him, and eventually drive him out of office. We'll see.
What will Trump do?
Trump is a promoter, he is concerned first and foremost with optics. He'll want to appear to be delivering on his promises, and making America great again.
Immigration? All trump has to do is to keep deporting at the current rate. Under the Obama presidency there have been more deportations than ever before. The machinery is in place, and those who do the deporting have years of experience. Trump can say we're deporting faster than ever, and it will be sorta true.
The wall? Already being built. He'll keep building, and claim credit.
Repeal Obamacare? He may be forced to embrace Medicare For All. Certainly he won't accept anything that doesn't plausibly look like he's keeping his word on delivering something "better." Even if they did repeal and not replace, it would only make things how they were a few years ago. We'd go from bad back to worse, not from good to bad.
Tax cuts for the rich? Happens under every Republican president, dialed part way back by every Democratic one. Business as usual.
Turn fossil fuel extraction on to high? Stupid, but if it gooses the economy, he'll crow about it, and say he's gonna look into AGW or something. We weren't accomplishing much anyway. Hello, fracking? Tar sands?
Let the vampire squid loose to run up another bubble? We're already doing that. The timing and severity may change, but not the fact of the matter.
In short, we needn't be driven mad. It's likely to be a bumpy ride, but not utterly unlike anything we've experienced before.
Oh, and on that Russian silliness. Putin is a bad man. But I take it that an indifference to the suffering of others is requisite to acquiring real power. He is not a super-villain, just a bad man. He wants to export more oil, and Trump wants to help him (and presumably get his beak wet). And maybe they helped him win the election, though no actual evidence is on offer. But it's run of the mill corruption, not treason.