Some thoughts for those involved in public prayer ministry.
1. Remember you are praying
All Christian prayer takes its cue from the gospel, from who God is rather than what we do. When Jesus teaches his followers how to pray he gives them thoelogy not technique. Christian prayer is, strictly speaking, evangelical: its impetus, shape and and direction come from the gospel. It is therefore trinitarian: we pray to the Father through the Son by the Spirit (Eph 2:18).
The NT gives a number of examples of Christians praying directly to the Son. This is a legitimate expression of Christian prayer, and there are times when we want to pray directly to Jesus. But the norm in Scripture is to pray to the Father.
Presumably it is not 'wrong' to pray to the Spirit, but given there are no examples of this in the Bible, and that the ministry of the Spirit himself is to point us to Christ, it would seem good for normative prayer to be to the Father.
We need to be attentive to this trinitarian framework, and not jumble up the members of the Trinity; for example, thianking the Father for his death on the cross.
2. Remember you are praying publically
We need to think about our motives for praying publically. Jesus rebuked those who prayed to be seen (Matthew 6:5). We are not to pray to try and impress others. We may win their admiration; we won't win God's.
We also need to think about our example. Jesus prayed in such a way as to teach hi sdisciples; it is no less authentic as prayer for that reason.
Public prayer will need to be:
Corporate. We are praying on behalf of others, and so our language should be corporate, not individual; 'we' rather than 'I'.
Prepared. It is good to have thought through how we are going to pray before we stad up to do so. For most this will involve writing something down. The number of people able to pray thoughtfully and coherently off the top of their heads is significantly lower than the number of people who try. Taking care to craft prayers thoughtfully makes them no less 'from the heart'.
Intelligible: Our prayers need to be those to which others can give a hearty 'Amen'. They need to be audible and free of technical theological jargon.