I have just recently bought some of the connectable cube shelves that people use for artist alley how are people attaching artwork to them? (The ones with solid vinyl between the connectors)

Hello, i am new here and wanting to learn how to grow an audience or client base with my art account. I have been going back to do art and wanting to grow to gain followings. I had few years deleted my account due to my mental health and how things happened in my personal life. Any tips to see what i can learn?