You can check out our more detailed guide to getting the best from the card design tool. It covers uploading your image file, adding an alternative thumbnail image or logo and what the image safe area is.
Did you know you can choose from a range of fonts, font styles, colours and sizes. Plus keyboard shortcuts for adding a copyright symbol.MORE - Card Designer Tool
Remember that the minimum order is just one card.
You can take full advantage of quantity discounts when ordering cards on the same card stock. Examples - smooth white card stock: