You test before each injection, before bed, maybe even in the middle of the night. The reviews here are designed to help you make that decision. Regardless of the meter that you decide to use, you should have to pay almost nothing for it. Manufacturers are always discounting their meters because they make their real money on the test strips. So check out the list of mail order pharmacies and call them before you buy.
Some meters have a special data port that can be connected to a personal computer.
If yours does, or you're just curious, see Computerizing Your Meter for reviews and software to download. Start with the meters with the smiley face, indicating meters that are recommended for use by children with diabetes. Consider what features are important to you, such as speed, memories, ability to interface with a computer, and size. Then ask your diabetes team to help you get a meter to try out. Also remember that you can usually get a free meter with the purchase of 100 or more test strips.