Question on introducing all new chickens

[KNChickens]

Slightly niche scenario question. We had bad luck with some straight run chicks this year (too many roos!) and find ourselves with only one new girl to add to our established flock of five. I understand adding one bird isn't recommended, so I have found some other same-aged pullets to be friends with our lone girl before moving in with the big girls. The new young ones are not an established group already - they will all be new to each other.
I can find plenty of suggestions about how to intro new chickens to established flocks, but does anyone have tips on introducing several new chickens to each other?
ETA: Older crew are all a year old. Young ones are 11-13 weeks.
ALSO: New young ones are coming from separate flocks within one farm.

 

[Yardmom]

With plenty of space (like a coop) several waterers and feeders and several things to hide behind I would try putting all the young together. There will be a bit a sparing, but since it is everyone for themselves I wouldn't expect it to get to bad. Obviously keep an eye on it in case one is a bully

 

[Mrs. K]

I would expect a bit of bluster, and then settle down. Your original new girl might have a bit of territory rights, but by adding several to her, and all strangers, it should go pretty well.