Check that the MLS data is accurate. 

I've got an eclectic background (qualified electrical engineer, computing background in health services, data architect in financial services) but my long term passion has been property renovation - I like the hands-on work!

Armed with this data, you will know the minimum you must cover each month.

It's all public data, but I can package it quickly and nicely.  

At least, that's what I'm seeing from the data input spreadsheet.  

Agent / brokers will by far have the most accurate data to evaluate properties, however, thats not to say you can't get a general idea for ARV using websites like Zillow.

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I was wondering if someone is aware of any type of Pro Forma software or subscription that has the flexibility to output data in simple, big picture, easy to read fashion?

Alternatively, they may create internal systems using office staff, a researcher at the recorder and a data vendor such as Title Point (at a cost of perhaps several thousand dollars per month).

Getting all your tenants up to market will take time and will likely produce some turnover, though.You'll need more local data to see what it would take to push the value up.