I would like to tie in my experience with mapping/graphic design to produce maps that might be beneficial to this community.I live in the Charlottesville, Virginia.

Rather than paying for an "ad" or posting on a website that may get no views, or being tied to expensive exclusivity contracts, landlords on Rentsta pay $1 per lead only when that lead gets matched and expresses interest in your unit.

Their money is tied up in the stock market so they are not able to do anything else anyway

If houses with those same ARVs have over 90 DOM to sell and rents exceed 1000-1200/month, that suggests a stronger rental market. 

Of course run the rest of the numbers. 70% rule ties loosely to the Gross Rent Multiplier and Cap Rate.You say your multiplier is 100. 

There is a garage with kitchen and appliances aka 'guest house' potential rental as a studio , currently is not rented but potentially could be for 450-500 with some tiling and flooring fix.The electrical of the garage is tied to one of the unit.Need advise in following:- How would you approach the possibility of renting the garage: owner pays bill for both and rise the monthly rent?

It's very possible someone may want to borrow a smaller amount of repair money at a good rate rather than tie up their own funds. 

When you start getting deals you will save time tying to  figure out what is next when you have a deal and are ready to bring it to close.

For example, if I'm not tying up lines of credit and can have $0 cash into a property that never costs me money, I'm happy to take the depreciation while my tenant pays off my mortgage in an appreciating market.  

We have fewer clients looking to tie up capital for very long time periods and I suspect that other sponsors see the same thing amongst their investor base.