You need to register on this platform and add your products, then the first sales will begin. If you do not understand anything at all in this matter , then the best option would be to contact specialists who will help you
Undoubtedly, you can contact the developers of this e-commerce platform. They will upgrade your website to the next level. They will make attractive cards for your products. And absolutely no data loss.
I'm sure you'll find answers to your questions and people to help you with that. Good luck to you