Hello Sushil

For sure you can register yourself as a seller on Flipkart.

what you need-

• GSTIN
• PAN Card
• GSTIN/TIN number- not compulsory for few categories
• Bank account and KYC documents (address proof)
• Minimum 1unique product to sell.

• Register yourself at seller.flipkart.com
• List your products under their specific category
• Once you receive an order, pack product and Mark it as "ready to dispatch" flipkart will receive it from you and deliver it to customer.
• Once the order is successfully dispatched your payment will done within 7-15 business days, based on your seller tier.