I'm going to leave them with mommy hen and let her raise them. So they should be able to follow her up the ramp from day one?
Mine did.... Mind you, don't be alarmed if she stays in the coop for a few days with them... I have had two broodies and they were completely different, one kept them in the enclosure for almost a week before taking them outside, and even then it was just outside the door, she was devoted for 7 full weeks.
The other broody wanted to leave the 3 week old chicks to their own pretty early, she would get up on the highest nest (5 feet off the ground) they found their way up to her until she kicked them out. It was her first hatch, I'll let her do it one more time and see if she cant be a bit more devoted.