Congrats on the soon to be additions! However, I suggest your parents slow down until you have everything ready. Better to bring home your new goats and have everything setup to maximize their comfort, rather than scrambling to make sure you have what you need.
Important things to have, basic list, obviously.
Shelter, area protected from drafts and the weather.
Enclosure/pasture, for them to have access from their shelter, so they can have space to play, run, etc.
HAY - Can be as simple as grass hay. Nothing moldy, old, rained on, etc.
Minerals - not a mineral block, they don't get enough of what they need from a block. Bags of loose minerals for goats are sold at most feed stores. This should be given free choice as they need, so they can lick it up. I give a few tablespoons at a time, and it lasts mine a few days before I need to refresh their supply.
A LIVESTOCK VET! Find a livestock veterinarian in your area! This is important, because problems can happen at anytime, like the middle of the night, during a storm, on a holiday, etc.
Grain - for goats who are under a year old, pregnant, or lactating. Adults who are not carrying, milking, or nursing kids, bucks, or castrated bucks (wethers) do not need grain.
I also suggest joining
Backyardherds and asking there. Definitely start a thread on there. People more experienced (and less tired at the moment, hah) can give you a great answer on how to start!