Decide what size stick you want to use. For a beginning rock drummer, a 5A would be a good size to start with. Find a brand of sticks that you like the most. Some brands have softer handles while others have a rougher hickory for a firmer grip. Find a matching pair - this is the most crucial step.
Some companies sell pairs of sticks together.
If this option is not available, strike the sticks down on a hard surface such as a countertop. When you find two that share the same-sounding pitch, purchase them. Unfortunately, drumsticks break fairly often. If they cost more than that, you're being ripped off. Inc. How things get done.