Hi Exhaustive!
Welcome to the OB! Nice to have you with us
Best way to tell whats going on with your leaves is to look at the roots. That might sound weird, but it's really true. The roots should be firm and white (sometimes they are a little green, thats ok too) as long as they are not black or mushy. Or worse yet totally rotted off. If your going to the plant nursery today I'd recommend buying a nice clear pot if the plant didn't come in one. It's really useful in telling when to water.
Don't be afraid to ask questions here! Everyone is really awesome and sure to have tons of information.