This is more or less "general" advise. Back ground is that I have planted food plots for deer and other wild life since the early 1970's. But all in the deep south.

Your plots of 100' x 100' are small, but a reasonable size. It is difficult to prepare much more than that without farm equipment.If you have access to a small tractor and a disc set, by all means use one.If not, a small walk behind tiller works fine. Lots of work but doable. You can also try a tiny disc set behind an ATV, but be very careful. Despite all the advertisement showing how easy this looks, that much "tow" is tough on the small, relatively light duty gears of a typical ATV.If you have about 2 weeks before planting, go ahead and overspray the plot now with Round up. That will kill any weeds trying to sprout.

For best tresults, get the soil pH tested ASAP. You are looking for around a pH of 7 to 7.5. If you cannot get that done, I suggest that you assume the soil to be acidic and apply lime. Sounds like you are relatively remote so may as well use pelitized lime. Something like 200# per plot is a start.

As for seed, check with the local USDA extension agent or the Michigan game folks. Michigan State shuld have some good info too. These should know what will do well in your area.Many of the commercial "buck blends" contain avariety of proven seeds, some of which will do OK somewhere, but not all of which will do well everywhere and may fail in your area, unless regionally blended.

Once the ground is prepared, you can broadcast the seed and fertilizer by hand or with one of the "lawn" push or pull behind spreaders. Drag the seed in with a piece of weighted chain link fence works fine. Or just rake it in with a hand rake. Be sure not to cover too deeply.

If clovers or Alfalfa do good up your way, I would think one or more varieties should work OK for a quick start. Forage type oats should work too and should do OK for later. If there are tons of deer in the area, don't be surprised that thefood plots are hammered and look like they are not growing. An easy way to check this is to set a circular wire column in the plot. This will give you a comparison between eaten and not eaten.