Best way to figure out motors and gear reductions

[TylerDSAudi]

I'm working on a few projects where I'm going to be using electric motors to run spools to bring in and out cables. What's the best way to figure out what rpm of motor you need and reductions ect.

I'm guessing you'll need to know the weight you will be bring in to make sure the motor can handle it as well how fast you want to bring it in.

Anyone got tips or websites for conversions?