All of life's experiences are for learning! If you are not learning you are not growing! Growing an Arts Business is a life's work. When you look at an Arts Business as a lifestyle you will grow and succeed at your art, business & life!
I recently have been playing! In the process researching too on how to sell an alphabet and found this site: CreativeMarket.com. They focus on selling your work to business'. Take a look at what they do. It might be a good fit for you! Good Luck!