The first thing Trump will do is gut the Department of Justice and fill it with criminal sycophants that will do whatever he wants them to do. And not do whatever he wants them not to do. Thus rendering the judicial system useless and destroying the balance of powers that this government has been built on and based on from day one. We already know he will do this because he started to do it the last time he was president. But the last time around he was somewhat constrained by the rule of law and the integrity of some other agencies and institutions. But the Supreme Court has now rendered him beyond the reach of any laws, or any agencies meant to reign in political abuse of power, for as long as he is president. So he has no more legal constraints. He can and will do as he pleases. All cases against him and his loyal cronies will be dropped, summarily. Any criminals acting at Trump's behest will be immune from prosecution, and so will Trump.
Is this really the "America great again" that you were envisioning? Because it's what you are going to get. A banana republic in which the rich "Massah" decides what is just, and what isn't. And of course he will decide this always as it serves him.
And that's just the beginning.
He's also going to create an army of armed thugs to round up supposed "illegal aliens" to be abused (punished) and deported. And you can just imagine the kind of men that will sign up for THAT job! Every pedophile, rapist, and wanna-be murderer will come a-runnin' from every corner of the country to sign on for that. As their moment to finally "shine" will finally be at hand! And no pesky Department of Justice to reign them in! Rape, robbery, murder, and mayhem ... Whee-Haw! Good times in Trumplandia!