Money management is easy. The tough part is the discipline needed to do it. Lets start with the money itself. Don't get more money than you could afford to lose. Take only that amount that you are comfortable losing. Always make sure you have enough money to pay your bills before you leave for the casino.
Next step is to plan how will you like to spend your money. Decide how many sessions do u want to play? Once you decide that, divide your money accordingly. Make sure you don't spend a major chunk at one time. If that happens you will be tempted for more, during the session you spend less time in.
In case the luck is not on your side, stop playing. Don't spend the last dollar available in your pocket hoping for a better luck. Always leave the table with a few dollars. This money can be used in some other sessions.
When you are winning, always put your starting stake and a little profit aside. This will help you in extending the numbers of game you play. If you begin to lose, just walk away with your starting stake and little profit. This will also make you feel good.
I mentioned discipline above. By that, I meant that you should accept the fate. If you lose, you lose. Don't get angry. Don't feel itchy to settle the score, just relax. For this you need to have the ability to walk away from the table Irrespective of the time you played for. Just be grateful that you won and leave. Don't feel that because you are there for a short while that you have to continue to play. The tables are not moving anywhere and there is no point playing for the sake of it.