It isn't really possible to write a walkthrough for this game because the items for each level appear randomly. There a couple non-intuitive tips with this game that might help you if you are having trouble.
- You don't have to pick up the products in order
- You don't have to wait for the farmer's truck to arrive and pick up the products.
- Pay attention to the order in which the truck travels around the yard
So when a level starts, just wait a couple seconds to see which items pop up, and then go from there. So if there are three flour and one meat, obviously go for the flour first. And then once you've loaded the product (in this example the flour) DO NOT WAIT for the truck to arrive, move on to the meat. You'll see a checkmark appear over the flour and that's how you'll know the truck has arrived. Just click on the checked items and move on. Also in this case, you wouldn't want to pick up the meat first anyway because the truck has to drive past the flour area before it gets to the meat area. So pay attention to the route the truck takes and then utilize it to your advantage so you do not waste time.
Also, sometimes when you try to restart a level, the game may appear to not work. Just quit to the main menu and restart and the game will start you where you left off.