The Music Minister should have most, if not all, of the Lyrics and Sheet Music, in the correct keys, available no later then Wednesday evening service, assuming a Thursday evening practice. This will allow those that need a chance to go over the lyrics and music a chance to do so before practice. This is especially beneficial to novice participants or those who are rusty.
Practice should be conducted as if it were an actual church service, except for corrections and retries, including all participants facing the congregation and using mics. Using the full ensemble allows the sound tech to workout any deficiencies on practice night when communication is not as disruptive as would be in an actual service. Nothing one can destroy a Worship service quicker than discord or miscommunication with the sound technician. During worship the sound tech works for the Music Minister.
Music Stands should be provided. Few things are less conducive to Praising in the Spirit then to have to turn your back to the congregation to read a line from the overhead.
The Music Minister should sing from a photo copy of the overhead to ensure that the lyrics sung are the same as those displayed.
Lyric sheets should be in a type style and size that can easily be read from arms length with a rapid glance. 14 point Arial seems to work fairly well. Also, using the overhead master as the lyric sheet ensures that the singers and congregation are seeing the same thing, typos and all.
Songs should be practiced and lyricised as performed on readily available recordings. Differences in style or lyrics should be noted. This will allow a measure of uniformity with the overall body of Christ allowing visitors and new members an opportunity to enter in easily right from the start. Using such a standard also limits the frustration of disagreements in how it is supposed to be sung. Additionally, novice or rusty performers can practice with the recording at home, albeit not necessarily in the correct key for church.
Songs should be sung in a key that the majority of those that desire to enter in can sing it in. This is critical. Music Ministry does not exist for those on the platform. It is a ministry unto the church, that is supposed to provide an ambiance to usher God's people into His Presence. This calls for practice and sacrifice from those that wish to participate.
Songs that are too tricky or complicated for the general congregation should be reserved for preludes, offering, specials, and postludes. The idea is to focus God's people on Him, not see if they can keep up with the key and tempo changes.
The Music Minister should be an example of Praise and Worship. And, must have both the heart and the anointing for Music Ministry. A three octave operatic vocal range or a Masters Degree in Music is useless without the heart and the anointing. Quality of Heart must always take precedence over educational or instrumental proficiency.
The position of Music Minister exists for the sake of supporting the Praise Team in their efforts to lead God's People into God's Presence. It is a servanthood position, first.
Likewise, the sound technician is responsible to the Music Minister and must provide all the Praise team with the monitor and sound enforcement they need to "perform" in the Spirit.