Hello! New to orchids and would like advice

[rocketshipwalker]

Hello, my name is Kayla and I've recently decided that I want an orchid.
I was at Lowes and all the orchids they have out for Mother's Day spurred my interest.
I didn't want to buy one on the spot, because I know next to nothing about them.
I've read through a few threads here and I've learned a little.

When I get an orchid, it will most likely sit on one of my windowsills.
Is there a certain windowsill that would work best?
I have one facing northeast and one facing southwest.

Do different orchids have different care instructions or all they all pretty similar?

Is there anything in particular that I should buy and have ready before I purchase an orchid?

Thanks for reading!
I might have more questions later.