819s are a great rim. Really stiff and strong, and minimal hassle for running tubeless obviously.
Tyre wise, there’s lots of options, but one of the cheapest and best IMO is Bontrager Tubeless Ready tyres. There are a few in the range, all require the use of some sealant to seal them, but you should be running some anyway really. Mud X’s are great through the winter, Jones XR’s are good for spring/summer use, and the ACX’s are pretty good all year round. There’s some new specialist dry conditions tyres too, but i’ve not tried them, and I doubt they’d be suitable for anything except XC racing in July in the UK.