Warning: This can get VERY expensive, very quickly.
Normally, you’d want to use an equatorial mount to properly track objects across the sky, but those are heavy. An alt-az tracking mount is sufficient for bright objects, like the Moon, Jupiter, Saturn, and Mars.
Something like an Orion StarSeeker mount with scope and a ZWO planetary camera can get you started relatively cheaply.
I’d recommend heading over the the http://www.cloudynights.com forum and do a lot reading and asking questions. Feel free to PM me, if I can help.
You can see some of my work here - https://www.astrobin.com/users/CGV/
It can be expensive. And if he goes alt-az mount for tracking, he’ll need to purchase yet another mount when he’s ready to go equatorial for the low light long exposure deep space images.
I agree, start small to see if the interest continues, but that can also be an expensive route when one has to ramp up their equipment to extend their reach.