As a girl, I bow with my hands behind my back. They guys seem to do it like that or with one arm across their stomach.
We always say, "Hello/Good evening/Merry Christmas (whichever), my name is _________ __________. This piece is called __________, by ____________." My teacher anounces us in groups of five. She just says from her seat, the next 5 performers will be .....Frank, Ben, Joe, Billy, and Bob. She warns us ahead of time to remember the name that is before ours so we know when it's our turn. If we forget, she has a list and will call us out. I always forget, LOL.
Save a real people pleaser piece for the end, to end with a bang. Or put a reliable student at the end. We go in order of our grade, so no one is intimidated by anyone before them. If there are alot of advance students, she will break them up though, so their pieces don't seem like one long complicated piece after another.