Ask friends to come out so you can build your skills. Try your new routines, cueing, music, transitions out on them. Tell them to bring a few friends. Then transition to a paying session, giving your friends plenty of notice and your information so they can pass it along to others. Place a small add in the church bulliten and let people know that they can now attend a fitness class in their very own church. Once you have those first people coming, others will follow!