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Use graphic editing software to create your t-shirt design. Hire someone to print your shirts. Take a few quality photos of your shirts. Price your shirts based on current market sales. List your shirts on an auction site to potentially make more money. Sell your shirts through an online marketplace for more exposure.
Download editing software, such as Photoshop or Illustrator, and use the tools provided in the software to create the text and/or images that will be printed on your shirt. Once you're finished with your design, save it.  Reference YouTube tutorials as you create your design if you aren't very familiar with this type of software. Make sure that the file type and size is appropriate for printing on shirts. A print-on-demand (POD) vendor, such as Printful, can print your shirts for you. Be sure to clearly communicate your t-shirt design, including the words, graphics, the shirt style, and the shirt color, to ensure that the vendor prints it exactly how you want it.  Consider what specific services you need in order to create a shirt with your design, and then seek out someone who offers that service. For example, you may need iron-on transferring, tie-dyeing, or silk-screening services for your particular design.  You can also pay vendors to take care of shipping for you. Without photos, potential customers likely won't even click on your listing. Take photos of the shirt on a hanger or mannequin in good lighting, and ask a friend to be your model so people can get a good idea of how it may fit.  For higher quality photos, use a DSLR (digital single-lens reflex) camera. You can also take the pictures in a room of your home that has good lighting and light-colored walls. Photos taken in good, natural lighting are more likely to display the true color of the shirt. Check different online websites like Zazzle, eBay, and Etsy and make note of the average shirt sale price, as well as the shirt printing technique. While you should price your shirts in order to make a profit, you'll also want to make sure your shirts are within a respectable range in order to sell them well. For example, if the t-shirt itself was $6 USD, the printing fee was $8 USD, the estimated shipping is $4, and you're finding that similar products are selling online for $17-28 USD, you might consider listing the shirt for $23 USD to make a profit of $5 USD per shirt. Auction sites like eBay or Bidz.com allow people to bid on your shirts. To post, make sure you create a listing that clearly describes your shirt, and include photos and a description of the shirt. Most online auction sites will compensate you for your sale via PayPal. Online marketplaces like Etsy prioritize hand-made, unique sales. They often let you make your own shop for free, and advertise your products on the main site. To post on an online marketplace, upload your photos and write descriptions of your t-shirts.  For each shirt you sell, the site will take a percentage of the sale for their services. These sites will often list items from your store on their general marketplace so that more people see it. Supermarket and 1000 Markets are examples of 2 other online marketplaces.