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Most seed supply companies carry it (Burpees, Park Seed, Johnny's, etc.). You can also check with local garden centers to see if they carry the types you're looking for.

The pesticides are not so much a problem. They normally do not drift very far unless you are experiencing high winds.

Cross pollination on the other hand could be a problem. At a half acre away, it will be minimal but you do need at least 100 yards of distance to prevent any cross pollination.

It is a bit premature for planting many of these crops in your area, as most will need temps of at least 65 degrees F. to grow well. Worst case senario for seed planting, however, is either slow or no germination. You will pretty much have to wait this one out and see how it goes. Should your more tender plants sprout, you can always add row covers for protection in cooler temps. Here is more information: https://www.gardeningknowhow.com/edible/vegetables/vgen/when-to-plant-your-vegetable-garden.htm, https://www.gardeningknowhow.com/edible/vegetables/vgen/row-covers-for-garden-plants.htm

This article should help: https://www.gardeningknowhow.com/edible/vegetables/corn/how-to-grow-corn.htm

This article may help: https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/contaminated-soil-treatment.htm

This article might help: https://www.gardeningknowhow.com/plant-problems/pests/animals/get-rid-squirrels.htm