Contact a local high school coach about volunteer opportunities. Without prior coaching experience, one of the best ways to become a football coach is to prove yourself as a volunteer. Communicate your desire to coach to defense, but take any opportunity you can get. An effective defensive coordinator must anticipate how an offense will attack his schemes, so experience from an offensive point of view may prove useful in the future.
Focus on a particular specialty and do it well. A defensive coordinator is often a jack of all trades, but that's because he has proven himself to be successful at each stop along the way. If the head coach suggests you help out with special teams, your future may depend on how well the special teams perform. Don't try to overstep your bounds, especially as a volunteer, as it may irritate the other coaches and possibly confuse the players about who is in charge.
Request an opportunity to sit in on coaching staff meetings. In many cases, as a volunteer or positional coach, you'll be required to attend meetings anyway. Showing an interest in learning from the defensive coordinator and head coach can go a long way toward enhancing your own knowledge of the game from a coaching perspective and improve your cohesion with the rest of the coaching staff.
Embrace each new role as a challenge. Not every change in responsibilities is considered a promotion or demotion. Coaches frequently shift positional coaches around to address team needs and to build a more knowledgeable staff. Always ask yourself what you can do to become a better coach and communicator. If you have concerns about your approach, ask the head coach or coordinator for ideas.
Seek opportunities, but remain patient. Reaching the level of defensive coordinator is as much about timing as it is ability. Assistant coaches at all levels, including coordinators, are at the mercy of the head coach for employment. Loyalty to a particular school or program often doesn't guarantee a job, as many head coaches prefer to bring in their own staffs. There isn't a guaranteed ascent to a defensive coordinator position. You may eventually be asked to step up into a coordinator's role at your current school, or move to another school for the chance to advance. Networking is important. Head coaches prefer to hire people they know. Your ability to land a coordinator job may come down to the effort you put in building coaching relationships with colleagues who have moved on to other programs, in addition to establishing new relationships at coaching clinics and summer camps.