I was the captain of the Colorado Nighthawks out of Colorado Springs for 6 years. We played tournaments occasionally, but usually scenario ball.
Getting together regularly and setting a rule for how many times per month you must attend a practice or get-together is very effective, I've found.
"Come twice a month every month or you're on probation." Something like that, even if they are friends, tends to keep it professional between you.
Work on the physical aspects, like 412 said, making sure your team can shoot, move, and communicate as a team and not just as individuals. Run 3v3 games against each other, changing teams each time to get a feel for how everyone works together.
Those are my suggestions.
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Rocking drop-forwards like they're going out of style...oh, wait...