First, always point the dot at the floor or the wall, never toward a face. Second, keep sessions short and playful.
Third, end with a treat or a favourite toy so your cat feels satisfied and has something real to catch.
Start with something simple and comfortable to hold. A good pointer should be easy to switch on and off and have a soft, steady beam. As your cat gains experience, you can move up to our patterned models.
The dot moves quickly, hides suddenly and never fights back. That combination triggers every hunting instinct a cat has. It is exciting, harmless and very good exercise when used responsibly.