If you switch jobs now, even to another W2, getting a loan may be difficult, at least until you have time to establish a track record in the new job. 

As recent as 2005 a flipper (builder actually) told me her track records was "hit and miss", she was looking for creative financing as the interest from hard money was too steep.  

I use excel and consolidate all income and expenses for each property (I add my mortgage payments and other landlord expenses) and make sure that my cash accounts reconcile for all my holdings (if there is a problem I call the manager and we try and figure things out).I use this excel for two things: Tracking my properties performance - mainly cash flow, cash balance, NOI and just to make sure the PM is on top of everything.I use this to input the data into QuickBooks (I do this manually). 

If you were buying an existing McDonalds location, you would be researching the management team, the employees, their track records, etc....

Other than signing a document that says you'll live in the property what other ways does the government track that you live in the unit?  

A transparent track record is paramount.

Starting younger is always a good track to run.As was said there is a ton of info in the mobile home section of this site.

They basically install a water monitoring device for each unit and track the water usage.  

A third business can be more lucrative and there are a lot of people willing to give me their financial support because of that track record.So now I'll be going back to my previous profession.

I'm looking for a spreadsheet that would allow me to keep track of all my income and expenses.