You are going to love it! Congratulations. And don’t sweat the whole being slow thing… My unit arrived around 10:30am and it was 7 or 8pm before I actually was able to make my first print.
Something that I missed, check out the support page in the app and you’ll find a link that walks you through your first three designs; technically you’ve already figured out the first, but the other two may save you a little frustration. (That and just know that “Add Artwork” will turn anything you choose into a raster image, even if it’s a layered SVG full of vectors)