Mail: How many have I selected? And can I drag

Two important questions with Mail:

I cannot seem to find a way to know how many email I've selected. How do you know the quantity of emails you select?

Also, I like to drag emails to an external hardrive and desktop to work on later, for some reason Mail does not seem to allow this in groups? You can only drag one email at a time off to a hardrive or new folder? It's very tedious. Any help with that great appreciated. Thanks.