Elizabeth, getting a very good map of current conditions done would literally be the first step (principle 1: observation). Figure out where things are right now, and then start looking at your zones and sectors from there.
I use this tool all the time. Enter your address and you can trace your property lines. I check the transparent fill so I can see the topo and satellite map clearly. Then zoom out, hit map and them terrain. So now you have a view of your property lines and the topography. You can then hit start a new area and trace out your topographic features. Then go back to satellite and zoom in. This gives you an overlay of the topo on a birds eye view of your land. cool.
You can also purchase USGS topo maps @ https://mapserver.mytopo.com
@plantwomyn – thanks for this! Was able to use “Grab” on the Mac & save it as a tiff file. Perhaps there is an easier way? Interesting – they recently updated photos of our property. Kind of creepy how much detail you can see!