A professional photographer will earn a decent sum of money. Therefore, if you have the ambition to become professional, then maybe you should learn to manage your money first.
One of the dilemma is that you should invest on better and advanced equipment. This can improve the quality of your work and attract potentially more customers.
Another point is that you will need to manage your store if you have one, or to purchase supplies like the films for your camera as well as the storage cards.
And the rest of the money, is your profit!