I was raised on farms with wells. No neighbors, it was the 50s and 60s, so no consideration of contamination. I have no idea what the flow was, but I'll guarantee it's possible to run it out of water. :-> It fills back in, eventually, and you may need to turn the pump off after you've run it dry so the pump doesn't burn out. You may also need to reprime the pump, depending on whether it's self-priming.

You don't wash several loads of clothes and shower at the same time. I doubt I'd ever water the lawn from a well, but you may have a gem that has all the water you'll ever need.

You need specific information about this well. I assume there are experts listed in the Yellow Pages that you can hire to tell you what information you need to know , then who will find out what you need to know and tell you.