Orangepi.org shows how to place an image in an SD card.
http://www.orangepi.org/

Also the Baikal site offers an img file.
https://www.baikalminer.com/support04.php

If you havent done this then take the courses on OrangePi.org.
You have stepped into a big undertaking if you have not worked with these devices before.
It can be a simple task if one has prior experience with following technical instructions.
But if you were hoping to buy an appliance and it just runs blindly then you have made a mistake.