A very noble initiative, and if you organize it right you will be no worse than Fiverr. Why am I putting Fiverr as an example? Fiverr is currently dictating trends in the development of marketplace services. We can take the business model as a basis for Fiverr
https://www.codica.com/blog/how-to-buil ... ke-fiverr/ and use it to create a stock on which every designer or musician can sell his or her creative work. It is also possible to give the possibility of developing graphics or music on demand but at a higher price. So it's your job to learn the latest trends and apply them correctly. Don't give up on this idea, you will have a huge audience. Because you can bring buyers and content creators together on one site. Good luck with the development!