I agree with everyone, a budget is a great starting point. For me, the two things that helped the most (beyond the budget) are.

- Pay bills on time so you don't have late fees
- Saving an emergency fund

Those two helped stop the bleeding and then I was able to take it to the next step.

Budget Budget Budget, Self-Control, Budget Budget Budget
Most people Fear making a budget, but once you get it going (AND YOU STICK WITH IT) it's easy, you will wonder how you ever lived without one.