Keeping track of all your books, where the money is going and how much is coming in, can be done several ways. You can hire someone to do your bookkeeping for you for a fee. This fee can vary depending on how often you want it done. For example, you can have a company do your books monthly, quarterly, yearly, etc. Another way to do it, is by yourself.
Some people still do it manually.
But more and more people are turning to computers. You can easily do your own books on a computer with a software program. If your computer is fairly new, it might have came equipped with a program that will do this. Two programs that I know of that do a very good job is Quicken and Microsoft Money. I would suggest looking on your computer to see if you already have it, and if you don't, you can buy either one at an affordable price.