Hi Jo,

Here's an article that should help: http://www.scribophile.com/academy/he-said-she-said-dialog-tags-and-using-them-e...

The double spacing is irrelevant. You start a new paragraph when sometime new is speaking. Somewhere around the halfway point in the article (or 3-4 sections in) they list some rules for using the tags. I think that answers your question. Let me know if it doesn't and I'll try to dig something else up.

~Robin