Well Nark pointed out the problems of your fire teams. I would like to point out your cost issues.
"15 dollars covers the ammo and game entry fee it also covers lunch." Now I hope this means your own events otherwise lets use Faction Wars as an example:
Entry fee 15$
Bio BB's 15$
Lunch 5$ Conservative estimate on lunch cost.
Total 35$
Now if you are saying that my 15 a month covers these kind of game cost. It would appear that you will be in the hole really quick.
If you are say this 15 a month covers only your practices and self hosted games. At two practices and a game a month, you will also be going in the hole pretty quick if your providing bb's and food for your players.
Now I don't know if you have played a lot of airsoft around the pacific northwest, but you may want to meet a few other teams and get an idea of whats going on before you try to shoulder the weight of a team. There are a lot of good teams out there try one.