[AD720]

Be upfront with your instructor and tell him/her what you want to get out of it. If you want to learn to read music, if you want to learn some deeper theory, ect. They should in turn be upfront with you as to their teaching style and capabilities.

I will say though that lessons with a good teacher are the best thing you can do and you will have a much lower chance of picking up bad habits or getting bored.