I have been looking for sorgum but I could not locate it. Is this just random or any place special to look?
It's pretty random which seeds you find. I think cupboards, trash, and some other containers are the most likely though.
That said, did you do the beginning farmer quest? I can't recall what it is called off the top of my head, but you can check on the possible recipes for coal or paper, and you should see a VERY long list of quests.
It takes one paper and one coal to "write" the quest, you then activate it by reading. Anyway, the entry level farming questv will reward you with a box of seeds, two (or is it four?) of each type.
Be warned: You will need your full inventory available, plus a few toolbelt slots IIRC. Otherwise whatever is left will drop to the ground, and may actually fall quite a ways away.
You must destroy the crate from the quest to get the seeds....you should also be ready for half the seeds (all the varieties, but half the total quantity) to drop just before you finish destroying the crate, and the rest to drop when you finish destroying it.
The other important point is that the quest is repeatable, just craft it again, as many times as you need to.