United Soccer Coaches 4v4, 7v7/9v9 and 11v11 Diploma Courses.
United Soccer Coaches offers these courses online at:
https://unitedsoccercoaches.org/development-diplomas/
US Youth Soccer Resources
US Youth Soccer provides sample lesson plans for specific age groups and based upon specific activities.
Washington Youth Soccer Resources
Washington Youth Soccer has developed a series of age-appropriate training plans, with accompanying videos, to help you design functional training sessions.
TheCoachingManual.com
You can sign up for a free account at thecoachingmanual.com and get access to a wide variety of free resources, including session plans, videos, and other training tools.
Academy Soccer Coach Practice Plan Designer
Academy Soccer Coach is a free-line tool to help you develop practice plans. It is a great resource and requires a free account to be able to access the library of templates.