Temperature is the most time sensitive element. Chicks that get too hot can die quickly.
For that situation, I would make sure the brooder is quite oversized, and longer than it is wide. Put the heat at one end and leave the other for a cool end.
They have thermometers on Amzn that can send the data to your phone and even set alarms, that might be really handy and reassuring, you could call someone to handle a problem, or if the heat goes out or there was a fire you would know.
It probably goes without saying that you would want to make certain they are secure from predators, including dogs, since you won't be there to intervene.
Another reason the brooder build is essential. I've brooded in all sorts of things but the more "temporary" the setup the more you need to check it and fiddle with it.
The next biggest thing is how chicks mess with their water. Stuffing it with shavings and knocking it over because they want to fly on top.
I would do 2 water sources, in different spots, in case they get to playing in one. Also raise them up, just a few inches to start but higher as they grow. I feel like I spend half the time raising chicks on fiddling with the position of their water to hit the right balance between adjusting for their naughtiness and making sure they can reach it. Sturdy blocks help.
Food is easy as long as you use a chick feeder with the holes so they can't kick or bill feed out. For some reason the long ones work better in that regard for me than the round ones.
An amprolium medicated feed is a good idea so you don't have the headache of worrying about cocci.
And if it were me, I would keep as many things standard as possible to eliminate weird variables that you won't be able to monitor.
Such as: Do use flaked pine shavings for bedding, don't add a bunch of additives to the water, avoid toys or anything they could get trapped in, avoid treats.
I think this can work out well, wishing you success!