I try to use this same routine every time I go to the range before a round-
Sand Wedge
8 Balls - I always loosen up with my sand wedge I hit half shots and don't really care if I hit them well or online. My main purpose it to get my wrists loosed up.
8 More Balls - Starting at 50 yards I hit progressively longer shots until I'm hitting full shots. This lets me get a good feel for how well I'm striking the ball and I also get a chance to hit a few feel shots.
8 Balls - Each with P,9,7,5 or A,8,6,4 (I alternate each range session)
10 Balls with my 19D Hybrid
10 Balls with my Driver
The above routine takes me about 25 minutes. If I have a few extra minutes I almost always go back to my wedges and hit feel shots to specific targets.
Other than my first 10 balls I never hit a ball without a specific target and distance selected. This keeps me from just going and just banging balls. Our range has sand traps and mowed greens with permanently mounted flags. I have all of these mapped on my GPS so I have about 40 exact distances to shoot at.
If I'm not playing I still go through the same routine but I do it with each of my two groups of clubs start to finish and usually try to work the ball on the second run through.
This works for me. I hit enough shots with each club to get into a rhythm but not overdue it.