Being overwhelmed is just another part of the game if you care and are trying. How do you eat an elephant? one bite at a time.

I suggest taking an inventory of the most likely risks your family will face. Gear you preparation to the most likely. Once that is pretty much under control, consider the next most likely, etc. [It is okay to be a little arbitrary about the rankings - nobody can tell the future, after all.]

The good news is you probably will not have to face anything to taxing right away. You probably have time to calmly and thoughtfully prepare for most stuff as well as your resources allow.

Sounds like you have a nice piece of land to start. Keep at it and keep us informed. Go get 'em!