Summary
To put things in order about how this author wants
us to think of now a prince should act, I'd like to make a source of a list.
Get yourself a kingdom, and preferably have your own army
while doing it since mercenaries are bad news. Be careful when choosing a place to take over. Even though it will be harder to conquer at first,
choose the land of a king with no powerful barons or ministers, because it will be easiest to maintain in the long run.
Make sure you kill anyone who might oppose you before continuing.
And choose a role model