An average 1960’s property requires at least $65k in rehab to undo functional obsolescence.

I want to know how many local leads can I get on a average month.

What is the average length of time it takes to fill a vacancy?

Some won't lend on a residential property (less than 4-units) with a conventional residential loan product, while others will. 

Maybe like a website that could tell you about all different areas (exp. average cost per sq ft. of a paticular area). 

They will average your income to calculate what you can qualify for...

Get a consensus of average rates, occupancy, and other expenses such as CDD's, HOA, and everything else associated with STR's to see if the numbers make sense.

On a pure dollars and cents point of view though investing here is not feasible partly because the average price of a home is over $600K but also because they are all negative cashflow even if you bought low and fixed it up.

As NJ being more competitive & prices are going very high & I earn average upto 25k on a flip in NJ, & hard to find properties that really make sense here.How’s the Leigh valley area in PA for real estate investors?

A by product, absolutely buy your WHY has to be deeper than that.