I start my practice off with some stretching, no point in practicing if you risk injury. I then move on to my wedges 5 shots with each to a certain area. I follow up by progressing through my bag in this order 9i,7i,5i,3i,3w,driver taking 5-7 good strokes with each. After that I'm pretty much warmed up and can finally begin take some good swings.
Being that I am 15 I feel as though I can just swing forever, often playing 54 holes a day and hitting up to about 500 balls a day. My coach gave me some advice last year and it is guaranteed to help anyone. For every ball you hit with anything other than a wedge, hit 2 with a wedge.
After I get done playing all day I like spending the last hour of daylight putting and hitting shots into the 18th green from the bunkers,rough, and fairway.