Have a trawl through this and you should find the information your after
https://www.backyardchickens.com/t/713334/growing-fodder-for-chickens
Also have a Google search for growing fodder for chickens. There are whole systems you can make etc.
Basically you buy growing seeds, be it BOSS, Wheat ( what I'm using ), barley or what ever you can get locally. Wheat is the most common and used by most.
Get your feed and soak a desired amount in water ( make the water twice the seed in the jar ). Soak over night. People say to rinse with a solution of bleach but I don't do that.
After the soak just rinse quickly and them spread out in trays or anything suitable NO soil is needed. Water twice - 3 times daily covering the seeds. After 1-3 days you should have fodder shooting and spreading roots. The roots create a mat, entwining through each other.
The fodder is usually ready to feed to your flock as an extra or can be used as a staple in their feed after 6-8 days.
Do not cover your plants as they will mold, try to keep humidity down.
They don't need much sunlight. Most people grow this in the Winter so their flock can get some greens through the cold.
The seeds after soaking have enough energy inside to make them grow to fodder. Just make sure you keep watering them.
Good Luck and do some research and a small test before getting right into it
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