I would like to create a customized sticker business!

For very long, I've been wanting to sell handmade stickers. I've made stickers for my friends and family members as gifts, and many people have recommended me to start a business... But I have no idea where to begin! I'm looking into freelancing and growing my image and reputation as a way of building my skills and learning more about what direction to go with starting a business, especially at such a young age.