I have always heard that 5-10% of your property should be planted in food plots, so that would be between 8 and 16 acres on your property. If you truly have no agricultural fields in the area, then I would error on the high side, which would be 4x the amount of area you currently have planned.
If it were me, I'd stick with the 6 or so smaller plots to hunt from, and put in a couple of really good sized ones as non-hunting feeder plots.
Seeds - go with perrenials in the largest plots, far less work in the long run.
“There are two spiritual dangers in not owning a farm. One is the danger of supposing that breakfast comes from the grocery, and the other that heat comes from the furnace.”