I’d suggest checking out real estate networking events (local or online) like REIAs or BiggerPockets.

You can find online mortgage calculators that allow you to play around and see what happens if you do an extra payment or increase your payments.

Now when your agent actually does the release then they send it to the listing agent and its is the listing agents responsibility to forward that doc to the sellers we do this all the time via docu sign or hello sign or whatever on line document system the local MLS uses.. somehow you seem to have this backwards..

I really believe that we live in a time where all the information you need to do just about anything is available for free online.

They were simply the king of online bookstores. 

Computers can analyze property based on subjective data (square footage, # of beds/baths, etc.) but cannot calculate for objective data (quality of kitchen cabinets/counters, size of bedrooms and bathrooms, view out the living room window, etc.).You should study the market yourself.

Monitoring open windows isn't feasible in my case, but I can definitely monitor daily electricity usage online  

The only 110v dryers I see online are small portable units.

It was tricky because the basement ceiling height is not quite 7'.From what I have read online, Fairfax limits STRs to 120 days per year, so it would not be feasible.

So, this whole "you must live in the property for 1 year" claim that we see online seems to be completely baseless.