Feed every one chick starter - have oyster shell on the side.
Do not move the broody hen to a place you think is best. Years ago, an old rancher told me, "She knows more about being a cow, than I ever will..." and the same applies to chickens. This kind of interference cause problems.
Do not worry about the chicks, getting down, they are fluff with a couple of legs. my nest is 4 feet off the ground, never had a hurt chick yet. Just let the mother handle the whole thing. Just make sure you have gotten the chicks a good drink of water, and a little feed before the introduction and leave them alone.
When people interfere, it confuses the chicks and the hen, and you do not get the bond established. Mother nature is heartless, and a fail to thrive chick might not make it, but sometimes they don't when I brood them too.
If you have adequate space for your set up, this will be a great deal of fun to watch, but you have to leave them alone at first.
Mrs K