This is the layout I like to use for a typical training session.
It covers skills drills, fitness and game practice. Each segment can be reduced or expanded depending on the goals for the session. It can also be done with any number of people from one up. If you are doing pure fitness sessions you can cut out the skills and team practice.
General Warm Up (10-20 min)
The warm up is vital to reduce the risk of injury, so don't do what most club players do and skip straight to the skills session.