I have my own performance sound equipment, for the two bands that I am in.
To get decent amplification, you need good mics, good placement of same---and, players HAVE to have some sense of how to use the equipment, how to place themselves in relation to the mics.

You also have to decide who the amplification is for: the audience? or the players? ie, where do you aim the speakers? If it's at the players, you have to deal with the large possibility of feedback...

Rich