Check you like your instructor!

With Karate or any good style of Martial Art, you should be approaching it with a long term expectation in mind. As almost all Martial Arts and Karate styles are long term sports. Meaning the aim is to continually get better and better. Becoming as perfect as you can be in every way – in fitness, skills, knowledge, character and spiriually. With the highest of morals, standards, integrity, principals and understanding of others. 

In short, you are going to be spending alot of time with your instructor in future, so make sure you really like your instructor as you are going to be stuck with them for quite a while!