Cats and Dogs

[Harro]

Hi
I am new to the site and need a bit of help I will be getting 2 Maine Coons (Brother and Sister 13 weeks old) in 4 days. We have a Bearded Collie thats 2 years old and was brought up by our Ragdoll Boots. We lost Boots to PKD and our boy still has not got over it, he was with him right up till the end with lots of licks and kisses, and is still fretting like we all are but it seems worse when I see how he still looks for him.
What is the best way to introduce all of them Albe our Beardie will want to kiss them, but that will be a bit to much as they come frome a breeder that is not dog friendly.
All input will be greatly appreciated.
Thanks