There are no guidelines, this is a family court issue only. What does your child support order say? That is what he is bound to, nothing else. If it says he pays support for x amount from his civilian job that is the same amount he will be paying when he deploys unless there is something in your child support order that says if he deploys he will pay a new larger child support amount. You know I often wonder if any of you military wives talk to or listen to your attorneys because it seems you all think the military is the secret answer to all of your financial woes. The military is no different than any other job your husband may have and you wouldn't go to his boss at Walmart and ask them how much HE is going to pay YOU for child support. Just like a civilian employer if you have a valid court order for child support and he is not abiding by it he can be served and his wages in the miltary can be attached but other than that you need to get your stuff squared away in court not with the military. Time to develop a real relationship with him also based on your divorced status since you are both still parents of this child. That isn't going to change any time soon and if you can't talk about important stuff like child support with him the child is going to have a very long childhood watching their parents cat fight.
To be an actual lawyer, you will need a law degree. Aspiring attorneys who wish to work in the corporate aspects of law should really find a dual degree program for their graduate work. After getting an undergraduate business degree (management, finance, accounting, economics, etc), try to find a school that offers a dual JD (Juris Doctor, the law degree) & MBA (Masters in Business Administration) program. Most are four year full-time programs where you will take courses to obtain both degrees. Depending on your particular interest in corporate law, you may want to get an MBA with a concentration such as international business or finance.