Create a plan for your income and your expenses. Identify what are your needs and what are your wants. Those things are givens. Consider food, child care, entertainment, insurance, your credit minimums. You see what money is left.
Money management comes down to discipline.
It comes down to the habits we have with money and really being aware of what we're spending. The tendency is, if we have cash in our pocket, we spend it. Don't go to the mall as recreation. If you're there and you see something you want, walk around the mall first, thinking about it. Set guidelines, that you're not going to spend more than X amount of dollars without consulting another person in your life.