Start by contacting your state board. You can find the link through the NAB website. You may have to take an administrator in training program before you can take your test. You should ask whether this can be waved due to your experience. If you have to take an administrator in training program ask them for a list of preceptors and start contacting the preceptors to see who is willing to train you. It is up to you to find a preceptor who is willing to train not the state board. Ask the state board about study guides and study sessions available for the state test. The national test (NAB) has recommended study guides on their website as well as information to enroll to take the test.