Have a list of your basic needs and wants. You have to make a priority then with your needs on top and so if there any excess you can have your want but limit only on those things you can afford. In that way you can divide properly your money.
It's easy to make a list and actually it's the first step because that is the plan that you need to follow.
To be successful in saving, you also need to have the discipline so you will be able to execute your strategy effectively.