The weight system helps offset your positive buoyancy to allow you to sink. During your in-person sessions, your instructor will help you determine the correct weight for you so that you can sink without carrying more weight than you need.
The most important feature on any weight belt is the quick-release system that allows you to release your belt with one hand in an emergency. The most common type of weight belt is nylon webbing threaded with weights and a quick-release buckle. Having a weight belt with right-hand release is standard practice with all scuba divers. This standardization allows for rescuers to release the weight belt quickly and easily, if necessary.
Wear your weight belt so that it is clear of all dive equipment. The belt requires little maintenance other than a quick rinse after a dive. Handle the belt carefully, and don’t drop it carelessly, which can cause injury.
Before you buy a weight system, you should first decide which type of diving you’ll be doing and then look around for a system that will work. For example, if you have to do long walks for a shore-entry dive, a soft lead pouch may be more comfortable on your hips. If you find that wearing a belt is difficult and that it keeps dropping off from around your waist, a weight-integrated BCD may be the best option. The other aspect that you need to consider is balance. In addition, it might be better for you to have small ankle weights to help with buoyant legs in a dry suit. As always, you can discuss the options with your instructor and/or dive center.