Consider lighting and physical space. Try to fill the space. Choose the most non-trespassed, inviting, quiet, prayerful location possible. Don t be surprised if turnout is low if your space does not facilitate prayer or community. Also, if you are in a circle, make it as tight as possible.
Empty space creates an empty feeling.
Recognize all the purposes of prayer. During services, you will see some individuals closing their eyes, others whispering to friends, and still others singing three times louder than anyone else. The competent service leader recognizes this and accepts it. Understand the texts. It is impossible for you to lead with integrity without at least a tertiary knowledge of the words in the siddur .