Locate a website that specializes in online design. Many of these businesses are available, and depending on what kind of designs you want to create, ie., T-shirts, photos, logos, cards or brochures, you should choose one to suit your needs best. A few popular online design creation and sales sites include Cafe Press, SpreadShirt.net, Zazzle.com, and RedBubble.com.
Join the website or become a member. You may have to pay an upfront fee, package fee, sign a user agreement, or pay annual fees to use any publishing tools or software available from the website. Follow the website's specific instructions for joining the network as all may vary.
Download any software or tutorials if required by the website, and follow their online instructions to create your design. You may have to choose from several templates, color swatches, or images. Some sites may allow you to upload files to use for your design. All sites will vary and will have specific instructions for design creation, uploading and sales.
Set the price for your design, and let the website do your sales work for you. These businesses provide you with all the tools necessary for you to make your designs, and will market them for you. Some sites may stipulate a sales contract with you, where they receive a portion of the sale, others may host your design for free, or pay you a flat rate for your design work. Ensure that you know the way that you'll be paid as stated in the sales contract.