You would need a seed/grain cleaner and a corn chopper.  As I said, very low margin, really close to zero and plenty of expense to pay out of that.

If you want to get into something while your young and make a decent return on your investment, I would jump throught the hoops and start processing biodiesel.  There can be a large margin and plenty of demand.  However, (however, however, however) you must be determined to succeed.  That will require lots of study and hard work.  The good side is that you can make a very good living doing it.

I would forget the feed business myself since you don't really know it and spend my time learning something with a profit potential.  To reinforce what I'm telling you, I have an operating and licensed feed mill that I would sell to you as a complete business or one piece at a time.  You want a corn chopper, I will remove it and sell it to you.  Same for a seed cleaner, a bagger, a pellet mill, a pellet cooler, etc.  Pick and choose and you can have it at a great savings.  Just don't expect to make any money with it.  There is no margin to capture in the market.