Please find a few sample practice plans on this page as well as the the Age Appropriate Practice Guidelines from US Lacrosse. These combined with Mobile Coach app can be great tools to running your practices. Getting organized prior to practice will make the session more effective for players and coaches. There is great information to pull from in here and adapt to your team, field size and practice time.  

US Lacrosse Mobile Coach
The Mobile Coach App has age sample practice plans, drills and videos for coaches.

US Lacrossse Practice Guides

Girls 5 - 11 Practice Guides
Girls 12 - 15 Practice Guides

Boys 5-11 Practice Guides
Boys 12 - 15 Practice Guides

Arlington Sample Practice Plans
Sample Practice Plan Sheet