You need to answer calls, build rapport, take down info, data entry, research the property, if it's promising you then visit the property, negotiate, fill out a contract, etc. 

There may also be pictures and amenities in the profile.You could try local PM's for rental data.I know it may be difficult to find data, but it must be done.

Using comps and market data, we are able to estimate the ARV. 

If so, what source  of leads have you tried, and how was their data?

If you don't know some of this information or you don't know how to analyze this data then you should probably hire some local professional advisors to assist you in looking at the financial ramifications of this lease to you. 

Local services typically just provide an excel file with new notices, or something similar - typically they don't match and append assessor records, track auctions, etc but it's a start.You could also consider using one of the national foreclosure data services - foreclosure.com, foreclosures.com, realtytrac or realquest.

One of the issues I'm guessing you may be hitting is finding data about the specific parcel.

I created a excel sheet where I insert data and it shows also a graph.

Then there is the rental data for the area.  

Are you a gifted data cruncher and love spending 40/hours a week analyzing properties?