A few things we can be relatively certain of:
He will pardon himself and his family members of any and all federal crimes.
He will fire masses of people in the federal government he considers insufficiently loyal. This will have to effect of letting him vent his spleen as well as leaving the government crippled for Biden.
He will expropriate as much taxpayer money as he possibly can to himself, his family and his companies. I expect he will relocate himself and the White House staff to Mar a Lago at exorbitant rates.