Relevent links:
https://www.satoshibox.com
https://www.blockchain.info
What you need do is you should upload your file or any documents that you are willing to sell into their storage and you will get link to share. After you share that link, potential buyer will click on that link and then they have to pay the amount that you had fixed earlier and the file or document will automatically downloaded in their computer.
So, Follow the following steps:
You can use BTC address from any exchange or from any other cold storage or paper wallets.
Some of the popular exchanges are:
Finally, everything is ready, Now the final step is that, share your link to your buyer (As I have mentioned in the video).
After buyer pays the amount the products would be automatically downloaded in their computer.
That's it! Everything is done, Now Relax and see your funds/ Bitcoin growing.