You can look for about $110-130 or so for officials per home game, depending on mileage and how many they send. Transportation to away games won't be too much different with fuel and bus driver pay. You'll need practice equipment, especially plenty of balls...Epic Sports actually sells one of the better practice balls I've used for about $6 each plus shipping. They've lasted better and had a nicer touch than some we've paid twice as much for. I also invested in a couple of flat practice goals for about $550 each...cheaper than regular goals, and you can play both sides at once. Divide a field in half by putting one of those between two regular goals, and you've effectively got four goals for the price of three...two teams can practice with two goals each.
If I think of anything else I'll add...
