Lots of questions...
Don't build an indoor market, sell outdoors from a portable stand, refrigerator or cooler. That solves the "market" issue. Signs are permitted once you are a farm, keep them on your land, not on the right of way, and buildings used exclusively for ag don't need building permits (coops and sheds...markets are not exempt).
Shelby Township has zero ag zoned property since 1963. Just remember that all nearly all land in SE Michigan was once ag land. We now have 400 chickens on our one acre and are surrounded by upscale homes. RTFA is for real. Just do it by the RTFA/GAAMPS and keep things clean and orderly.