What are Malcolm's first actions upon taking back the throne? What does this suggest to us about his reign?

Malcolm says he is going to reward all the men, like Macduff, who were loyal to him. It sounds like he will at least be a well liked king by those who supported him.

We shall not spend a large expense of time Before we reckon with your several loves And make us even with you. My thanes and kinsmen, Henceforth be earls, the first that ever Scotland