Care is basically identical to a corn snake so you can check out some of those care sheets. I'd personally aim for a bit higher night ambient temps, especially for the few days following a feed. While not entirely necessary, you can't really go wrong offering more natural options(predators and parasites aside) so I'd say go for the UVB. Younger florida kings will be more arboreal than their adult counterparts so feel free to offer some vertical climbing and cover options. Many will burrow a fair bit too so a few inches of shredded aspen or similar bedding that holds form for tunneling wouldn't be remiss either.