Two basic stategies:
1) If you have time enough to scout and spot some flocks, they are easy to pattern (ie: they are creatures of habit and will basically repeat their same daily routine until something changes it). You can set up an ambush by setting up between where they fly down to and where they want to go (such as where they feed and/or water).
2) As mentioned you can find the flock and then you can try splitting up the flock by running at it like a couple of screaming bushes. Best done with people running in from different directions to scatter them to the four winds ... note that just pushing them all in one direction is not a scatter and will not get the desired results ... and you may have to attempt it again. Once scattered, set up as close as you can to the scatter point. If you're trying to get a hen or jennie, wait at least 30 minutes, then start calling with kee kees and kee kee runs. Hen assembly calls will work also. If you're trying for a tom or jake, wait only about 5 to 10 minutes and call using gobbles.
NOTE THAT USING TURKEY CALLS PRIOR TO ANY SEASON TO TRY AND LOCATE THE BIRDS JUST TENDS TO EDUCATE THEM AND WILL MAKE IT LOTS HARDER TO ATTRACT THEM DURING THE SEASON. ESPECIALLY IF YOU ARE "BUSTED" BY THE FLOCK, THEY WILL RECOGNIZE YOUR VOICE AND GO THE OTHER WAY !

Good luck on your hunt ...
