Can I ask have you ever had hens before?
Rescue hens do come with the need for extra care, and if you are not used to hens it can be overwhelming for some. I took in 12 to go with the rest of my girls and introduced them gradually, within 3 weeks 5
of the rescue hens had died, so be prepared and make sure you have a 'hen first aid kit' just in case.
Obviously as you are getting ex-bats there are no cockerels. You did not say who you are getting them from, but most you will not get a choice of what to pick, so be prepared for some sorry looking girls.
To the poster who said you usually have to keep your hens indoors for a few months every winter is quite wrong, only if an instruction is given to keep them under cover due to an outbreak/suspected outbreak.
You do not have to inform your neighbour but think it would be best to do so, yes they can get vocal, but on the whole I have found ex-bats to be quieter than pure or mixed breeds, check your local council on keeping hens.
All going well your new girls will give you pleasure, for some time to come but they will not live as long as other non bat hens (I have hens 13 years old, oldest battery one lasted just under 4) but enjoy them, but be warned....once you have then you will always want them in your life, mine are spoilt rotten, and they deserve it!
From a chicken keeper of many years.