The following is some information on what I think is important in a teacher. They are things I am constantly aware of and try to bring to the lessons I teach.
I think the first thing you need to look for is someone who is in it for the right reasons. That is, they love what they do and are not just in it for the money or until something better comes along.
Do you matter or are you part of a “sausage factory mentality”? It’s important that you are treated as a person and not a number, with some larger music schools you can often get lost in the turnover of staff and students.
The lessons need to be private, that is one on one. Group guitar lessons just don’t work. You need individual attention when learning an instrument like the guitar.
A good teacher will have a plan in place. Even though every student is an individual with their own specific needs the teacher should have a basic framework for the lessons. It’s the method for ensuring and measuring progress in a logical well thought out way.
They need to have the experience and knowledge to understand what it is you are wanting to achieve and be able to guide you along the best path to achieve your goals. This truly comes with time teaching and playing guitar.
It’s also good to have a connection with the person that is teaching you. If the personal connection is not there it makes the learning process difficult if not impossible.