We would give the tape out and tell people if they wanted to hear more then come to a prayer meeting. It was also a way for people to bring the music of a prayer meeting into their homes and cars. Fund from donations for our tape have enabled us to acquire equipment and set up for large gatherings with a state of the art sound system. These tape donations also freed us from the concern for money so we can focus on praise and worship. With instruments, there is no standard but for a full sound the absolute minimum is a guitar, bass and drums.
Great additions are a lead guitar and a keyboard.
Pray that the Lord send willing musicians and ask for their commitment for at least one year. Insist on commitment as a requirement and understand that some cannot give it. If they can't give it then they should seek another ministry in which they can be committed. However, do not reject them as brothers and sisters in the Lord because conflicts prevent them from joining. Offers great control of volume and easy set up.