Get a net with an aluminum frame. They are lightweight and easy to maneuver.
Step2
Choose a size that is going to accommodate the size of the largest fish you plan to catch, though most of the sizes are pretty standard.
Step3
Select a net based on the fishing situation you plan to encounter most often. Long-handled nets are more adequate for boat fishing. Teardrop shapes cut through fast water currents best and are easier to carry on your back attached to your vest.
Step4
Use a cotton or nylon bag, not plastic or monofilament. Cotton or nylon won't be abrasive to the mucus coat of the fish. Get a net with small holes so small fish won't get through them and larger fish won't get caught in them.
Step5
Think about how you'd like to carry your net. You can attach it to your vest in a variety of ways, from a clip to Velcro to spring-loaded cables that you pull out and release to retract. Try the different methods out in the shop.