There is a board on AFN for growing in coco.
If you want to know what to do with the brick, I think all you have to do is find out if it has salt in it or not. If it does, it needs a good rinse before use. And you need some space or a wheel barrow to hydrate the bricks. They expand to like 10 times their size when hydrated.
After that, there is that board for growing in coco. Lots of info there on growing with coco. And later people will be able to read all the answers you get just by going to the coco board instead of it being buried in the Mephisto board.
Good luck with the last of your bean stash and the winter grow!