The tiny houses would be so much cheaper than new builds but will like to know the average lifespan of a tiny house.

The lowest price is over $3,000 and the average is around $4,000.

My clients that do this actually do quite well and by quite well i mean 250k NET a year or better. .. far better than your average wholesaler. that is competing with a hundred other wanna be wholesalers for those same beat up inner city homes :)

And return to investor apr was 23.3 % I made the rest. this deal start to finish was 88 days.. average though is closer o 120 to 140 of course. 

And how long on average would you say it took you to become the owner and take possession of the properties (to flip or rent them I suppose) from the moment you purchased the debt? 

In general, Indianapolis is currently a Seller's market with an average of 9 days on market.

So I made a compromise with myself, instead of putting that $100 directly to my principle, I'm opening a brokerage account that will have $100 deposited into it automatically every month and invested in index funds using dollar cost averaging method.

AirDNA (I always check multiple places) says this property could make a $500 average daily rate (ADR), with 65% occupancy as a basis.I pulled up the new BiggerPockets STR calculator spreadsheet and realized this might be a winner.After entering all of my research numbers, it shows a potential CoC of 12.49%, a monthly profit of $14,385, and expenses of $12,442 (even with a 15% management fee).

Have them give you their opinions of the different areas, look at the incomes and average home prices. 

If that baseline average is an acceptable figure, then go a few notches up from there with your design and amenities and you should do well.