I create sheets of stickers intended for use in creative journaling.
I use Onlinelabels.com to print my finish product, which is designed digitally. Once printed, I use a die-cut machine to cut out the shapes of the stickers.
It's important to play with your printer settings when printing on different types of sticker paper. Once you get it just right, save the settings as a preset so you can easily find it again. I also find it helpful to create a master list just in case!