Welcome to the CUTE family Lucy!

Here is another tutorial from Starbird:https://www.starbirdstockdesigns.com//asp_pages/Projects.asp

thanks for asking I always wondered about that.

You don't hoop the card but the stabilizer. The emblibrary video is a good one. You'll find video's on all sort of embroidery on that site as well. Worth looking when you are starting something you never did before.

Lucy What a great question. I've thought about it, but never tried it. Thanks for asking. And Welcome...

Embroidery Library is a good place to look they info on all sorts of things and good sound advice is is too. I think open type designs would work best as a filled design has too many stitches and therefore too many holes around the egde so the work may 'pop' out of the card.
I have given the link to the home page just click on Projects on the lefthand side of the page.
Welcome to cute is a grand place to start any machine embroidery related query!