DECA Map No. and Promotional Gifts Use car sticker printing

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Dear Miss ,My name is Valerie and I am in the U.S., I am hoping you can help me with my queries.I have purchased many "themed" sticker packs on Aliexpress. These are the full color, removeable, water resistant stickers typically used for car, truck, skateboard and laptop and sold in sets of 50.I have been casually reselling these and would like to try to add some of my own designs as well. This would mean designing themed sticker packs of 50 original stickers (not identical). My question to you is what is the most economical way for me to go about doing this? I am hopig to "test the waters" before a large investment.I would much appreciate any suggestions you have for me!Thank you, Valerie