First-Time Snake Owner, Considering A Ball Python

[Dagger311]

Hey everyone, just joined, so if this is in the wrong place I apologize.

After convincing all the members of my family that it is physically impossible for a ball python to directly kill someone (Barring a nasty infection from a bite, I guess), They've agreed to let me get a Ball Python (Or other similarly-sized snake). There's a local pet shop near me that's been around for years and has great reviews (Although they don't have a lot of different morphs), so that's probably where I'll be buying from. The only problem is, I've been told so many different things about how to care for them, that I don't know which is right.

I've been told they need a heat lamp, because they don't feel belly heat and it won't be able to thermoregulate properly or will burn themselves with an UTH.

I've been told not to get heat lamps, they're nocturnal and hate bright lights, and to get an UTH.

I've been told to get both, because they like both, and it's impossible to make the hot end too hot, because my house AC will kick in and cool it down.

I've been told not to really worry about humidity unless they're shedding. I've been told to make sure it stays at 50-55%, etc.

I've been told 20 Gallon long tanks are the perfect size for adult BPs, and I've been told that 40s are perfect, 20's are too small, etc.

I've been told to get a glass tank because it's more natural for the snake, but then get told to get something called a vision case because the glass ones lose humidity.

I've gotten so many different temperature ranges, from 80 ambient with a 90 basking spot, to 78-82 on the cool side and 90-94 on the hot end, to 85 all around.

I really want a Ball Python (Or a Mexican black kingsnake, but no one sells them around here), but I don't want to get one until I know the best way to set up a tank for them and care for them. Can anyone help clear any of these things up for me?