No, don't approach the AD. You are building a resume as you work. Those that you coach against, those of whom you coach their children and those players all will know what is going on. Build a good foundation. You will also have to have patience. I was an assistant for 12 years. I thought I was gungho and knew it all when I was a pup. However, I learned so much more in that time. My Assistant has just now become the head coach since I resigned to watch my child play. He's turned down several head coaching offers since he wanted to stay in our school district. He and I have always been honest and YES HE PLAYED FOR ME IN HIGH SCHOOL, he was also a college coach for a while. I told him that when my child entered HS, I was going to be a dad for 4 years and I'd make sure the job was his. That would be a good talk for you to have. Ask what the head coach's thoughts are and how long he plans to stay. Let him know you want to be a head coach someday and so, you want to work hard to build your resume. BE ABOVE BOARD IN EVERYTHING YOU DO! If you find yourself thinking anything along the lines of undercutting the head coach, if you do, you'd better be able to win the battle for the head job because you'll be out the door otherwise and with a bad recommendation. JMHO!