Ok I've been trying to decide on how to do characters for a long time, I have decided to make it like this.
There are a certain amount of classes you can choose from.
Each have certain weapons.
So basically its that simple. I decided that instead of buying the weapons at the beggining because its a lot like Counter Strike.
Also :
If you pick up someone's weapon that they dropped you gain ammo for your weapons.
Grenades are only for some classes.
Hopefully this will work out.