Plannin a outdoor grow for the first time and I have several questions...

I have 10 donor plants. I know I am still a few months away but want to plan everything now and be ready. I have an ez cloner and can clone 120 plants at a time and do not have to have in any medium to root. I plan on growing in southern Michigan. My questions are:

If I use the cloner to root can I just stick in ground or do I need to grow inside for a while in soil?
If so, what kind of soil do I use? (I just put 5 donors in sta-green that feeds for 9 months and they are doing great)
Does anyone know the last time farmers are usually in corn fields before cutting? I was thinking about putting in rows of corn but I'm afraid the farmer will find it.
Any info. is appreciated!

would probably put them in some potting soil and grow them indoors for a couple of weeks before moving outdoors.
while im way further south than michigan around here corn fields would get chopped way to early to even think about putting plants in a corn field.