I want some modifications on my existing, LARAVEL website

1. Create a video section on the product page, link on YouTube. [login to view URL] project has already SKU, section. but that has some issue on that. When I create the first product, the example SKU is 123456789-BLACK. After that when we added on variants then, Example. Blue. Then SKU creates 123456789-BLACK-BLUE. It will be right, 123456789-BLUE. 3 When products have to out of stock, then not show on the product page out of stock. We want to show that on-page all. 4. If customer want to cancel the product, this option not available on that. We want to make that. (This option available before product shipping) 5. Create maximum & minimum quantity option for buy option. ***Please don't bid unwanted price, we are a company, we already worked locally. so please bid right price***