Once the leads start coming in, you'll start to see what produces results and can effectively manage your time from there. 

I work in California, and you will never see the 2% rule in effect, unless you're down there right near Mexico.

He rejected this, effectively calling me a slimeball for refusing to pay him the $750 outright.Am I out of line here?

If you want to test the effectiveness, buy another domain and put that on the side.  

Definitely follow @Joel Owens  counsel.  

Manage your property effectively, be especially careful in the area of safety, use common sense, and have a lot of liability insurance.

By disclosed, I mean have her sign something to the effect.  

The following was found in a google search:When septic systems are properly designed, constructed, and maintained, they effectively reduce or eliminate most human health or environmental threats posed by pollutants in household wastewater.

I'm struggling in finding resources on how to effectively and accurately calculate the value of property as well as AVR.

The latter option would save you the out of pocket expense while effectively financing the cost over the period of the loan.