Glad you could join the flock! Congrats in your new girls
I too would not add them to your existing birds untill they have finished their moults as they will be down in power right now. Will certainly be best to add them when they are feeling in good health. Plus it gives you chance to quarantine your new ones so you can be sure they are not carrying any disease that could affect your exsisting birds. I have found that my birds do ok during moult by staying on their layer feed but I supplement them with some scrambled or hard boiled chopped egg. They also have a poultry vitamin and mineral supplement in the water. You could always switch them to a grower feed as this is higher in protein for them.
Wishing you the very best of luck with your new ladies.
Enjoy BYC and all the chicken chat