Start off figuring out what style you are looking for. Is it acoustic or electric? What music styles are you looking for? From country and bluegrass all the way to heavy metal and rock, there are so many different styles of guitar music. If you are just starting out and are not sure what to begin with, this is okay. Some instructors are very good at teaching beginners and helping them find out what they are passionate and good at. If you do know what you are interested in, the best thing to do is to find an instructor that teaches that style. On Lessons.com you can do this by reading through the teacher’s description.
Justin, first off I just wanted to say thanks for all the advice and instruction. You make playing guitar easy and understandable and fun. You explain very well the hows and whys when presenting a new song to learn and walk it through so that anyone can learn. I have played guitar for 20 years now and have learned more from you in the last five years than the previous 15 by myself. You have also been a tremendous help to both my son and my daughter in learning to play as well by making playing fun and interesting. I have a couple of pictures of me and my children all doing what we love. Many Thanks to you Justin