There's a lot of big questions out there, regarding the sticker world. Here's a few articles that may answer some of your questions. If you have any other questions, maybe search in the FAQ or use the contact form to ask me a question directly.
How to recognize sticker sets ?
Lost in your impressive sticker collection ? Here's a little tutorial that can help.
Why do some of my stickers have a creased corner ?
Ever wondered why some of your sticker have a crease in the corner ?