Hi there and welcome to the forums. Good for you to get back into the groove. You are most definitely not the first one here to have to juggle family, day time job and DJ-ing. The good news is that you can get there easily with as little as half an hour practice a few times a week (ideally daily … but hey :-)).
A good place to start is the How To Digital DJ Fast course by Phil Morse. It will get you acquainted with the entire digital side of DJ-ing quickly. Even if you have DJ-ed before, you will probably find it a good place to start and get you up to speed in a very short period of time. And it will have you spending your time practicing the right things the right way rather than spending time finding the info yourself (google, youtube) and then trial and error-ing it til you got what you need.
Best part is the money back guarantee, so if you feel you didn’t get your money’s worth out of it, you won’t have tossed any money.