Perform your own investigation and build your own rent roll/spreadsheets to confirm everything.

You need to start with a thorough investigation into the property and it's current condition.

I've seen a couple that, I've copied for further investigation later.

I can't tell you how many times I've seen this - both in working complex investigations in law enforcement and in dragging loans across the finish line to the closing table.

After 45 + years investing in, purchasing and selling notes and real property; structuring “deals”, running investment funds and syndications, I have observed that many (most) investors both hesitate too long gathering too much information before making an offer AND do not do enough investigation, analysis and due diligence before they finalize a purchase.Seems like opposites, right?  

I’m sure you were just being helpful, but you can be sued and investigated.

I've never used QuickBooks, but after investigating, it seemed that I would have to go with the Desktop version (versus the cloud based version). 

We are taking steps with BP to investigate this.

I told them I needed to investigate their company first before I could commit to something like that; no investor should take risks under pressure.

Here are some good places to start: http://www.biggerpockets.com/meet- find and connect with other BP members that are in your area.http://www.biggerpockets.com/alerts - Set up keyword alerts to be notified of the topics that interest you.And, of course thehttp://www.biggerpockets.com/forums - ask any question about real estate!