According to ZEPPO, you need PAN card, company named VAT/TIN, Company registration xerox copy, and address proof. If you go through ZEPO then you can submit these document once and able to sell your product on Snapdeal, flipkart, amazon india, shopclues and few other sites. This way you save up on trying to get approval with documentation hassles on your side. I think this method is much better than single joining place. Ebay and Snapdeal is a good place to start your store.