I live in a swamp next to the jungle in North Sumatra, Indonesia. This is their natural habitat. It’s also the natural habitat for wild junglefowl from which all chickens are descended, so chickens and monitors are used to coexisting.
As I typed my last reply I noticed a huge black eagle flying low overhead. I’m far more worried about those, but the chickens are good at spotting them and quickly get under cover.
There’s not much chance of keeping away from them - there are lots of them here. The chickens know to keep their distance, and the monitors keep away from humans so there’s not much to worry about. But they will eat eggs if they can find them, which is why we keep our nestboxes on our terraces...
Pick a breed you like the look of. They all lay eggs and pretty soon you’ll have more than enough. I started out with point-of-lay pullets - 20-week-old female chickens. If you can find a local seller I suggest that’s a good way to start. Four pullets is probably enough to start with. Consider...