re: First time soccer coach

Like The Mick and TN Bhoy have said (I can't believe I'm agreeing with TN Bhoy), focus on the basics on the game first. Passing, dribbling, shooting, and fitness. Developing the players' touch (ability to trap and control the ball well) is important all over the field and it translates to virtually every part of the game. In my opinion, spacing, positioning (the advanced stuff, not just "you play defense, you play midfield, you play forward, etc."), tactics, etc., are things better learned secondarily for 12 year olds, especially if the basic skills are lacking.

As Mick said, youtube has tons of videos to help get an idea for drills and practice. Enough soccer balls for each player, a couple of goals, some cones, bibs (the mini-jersey things), and a whistle should be all you need to get started.

Encouraging the kids to play when they're NOT at practice is the best thing you should encourage. 4-5 hours a week of playing soccer while at practice won't be nearly enough to increase their skill if any of the kids want to play later in life. They need to touch the ball every day.

Good luck!