Please let me know when they're in stock

Yes , we have this item in stock.

How to buying puppet?

You can buy it from www.puppethut.com

Would an arm rod be useful or appropriate with a 14 inch Katie?

An arm rod isn't necessary with the 14" puppets as you are able to put your fingers in the puppet arms to move them. However, some people do like to attach an arm rod to move one of the puppets arms.

Can I come to your store to see the puppets before buying? How can I retrurn them? Can I use them in my youtube videos?

We only sell online.