vue - Agricultural Simulator 2012 Deluxe, Ep004

1. Strawbales are the left over stalks of wheat, barley,etc. You can gather these straw bales and sell them by putting them on the convyer belt, its by where the manure is stored. I havent worked with grass, but from what I understand, you mow grass, that grows everywhere but in the fileds then you can come along with a rake, and then baler, to create grass bales, or you can simply mow, then get the big combi wagon to pick up mowed grass, and transport it directly to the driving silos by your house
2. What are straw bales for if animals eat grass bales? And also, how do I get grass bales except buying them?
3. Not as far as I know
4. Can i download mods for this game?