What kind of engine do you want to make and what is your goal by making that engine?
The generic, one-size-fits-some advice is: Go and make three games, and by the time you’re done with the third game, you’ll have a clear idea of what you want from an engine.
The generic, one-size-fits-some advice is: Go and make three games, and by the time you’re done with the third game, you’ll have a clear idea of what you want from an engine.