I need a catalog site for my business

I need to create a portal that will fulfill three functions: 1. That the sellers use it to see the stock 2. That people can enter and place orders. 3. Make the UI / UX be fast and modern Points to make clear: 1. To understand the niche, visit [login to view URL] 2. The administrator can load products for a provider. 3. There is a administration panel for the provider. Which means that each supplier can enter to update their stock. 4. When the supplier updates a stock or product, before being published on the page there must be a filter on our part. This would mean that in the administrative panel we would see the products to be approved. 5. A notification would also arrive to the email to be updated. 6. Every 6 hours send that notification to remind the administrator until he or she approves it. 7. A topic that I saw that would serve so it is fast is [login to view URL] since seeing the product is showing the amount of the stock. But if they have any other alternative we are willing to see it. 8. As in my country there is still not much that is the Ecommerce, when a person adds it to the cart and wants to checkout. The order should arrive by email and in the administration panel. 9. We have to have a documentation or manual on how to use all the functions. 10. You do not have to identify what is done with wordpress, this would mean changing the login address. Icons, wordpress texts If you have more questions, we are willing to respond. Greetings.