Being an instructor is incredibly fulfilling and enjoyable although I wanted to be an instructor from day 1. I started as a Jet FO and then moved into instructing for the love of it.
I sincerely hope that you don't want to become an instructor just to Build Hours! There are far too many people like that who give substandard instruction to people who then go off and cause problems through no fault of their own.
It is a career that needs to be taken seriously and not seen as a stepping stone into the RHS of a jet.