If your kitten is young, you can train him to a leash and harness now, and he will associate it with "ooh, goody - when I wear this I get to go outside!" Has he been to the vet yet? A good general check-up, and any needed vaccinations (I don't know what's needed where you are) and the kitten should be good for supervised (on a long leash) trips outside! That way you are not only there to scare off any predators (certain hawks and owls regard a young kitten as "snack food"), but you can watch and make sure he doesn't pounce on and eat anything he shouldn't! Certain lizards have Hepatic Flukes that can then kill a kitten or dog who eats the lizard.