Assess the space itself, because this affects the acoustics of your sound, and some physical locations have acoustic limitations that even a great sound system cannot overcome. Locate where there may be echoes, muffled sound or indirect sound affecting the components of the sound system. Also, find where the power outlets are in the room, necessary for the mixer.
Position the loudspeakers so that they will direct the sound properly into the room. You either need to have a central loudspeaker with a wide projection arc, or you need two speakers, one on each side of the main room, angled into the room. Place the speakers on stands to elevate them above the heads of the audience. If you are using wall mounts, test the best placement of the speakers before mounting them to the walls.
Wire the sound system in a chain that connects the microphones (sound input) to the mixer/soundboard (control), through the amplifier to the speakers (sound output). The more components you have for sound inputs, the more complex your system becomes, because several microphones, instruments or stage amps feed into the mixer and require balancing to get a satisfactory output.
Plug each input item into a different mixer channel. Label each related item (microphone A, mic cord A and mic mixer channel A) with the same color electrical tape to simplify connections after teardown.
Check input and output jacks on the speakers and amplifier to make sure all the connections flow in the right order before turning on the system.
Test the components one by one to make sure they each register on the mixer board and through the loudspeakers. Make any adjustments on the gain input volume for each component.
Turn down the main speaker volume before balancing components. The sound technician should use headphones to balance the components. If two sound people are available, turn the main speaker volume part way up and have the second person walk to different areas of the room, checking for an even balance of sound and components. Adjust until the balance fits your worship or event needs.