Where would you get the information to calculate a cap rate on a 4-plex? 

I would also go to local clubs and get togethers to network and get your information.  

If they don't qualify or do not have the funds, then inform them they all have to leave.....you need to find a new tenant (especially seeing as they are already falling behind).

Many Realtors and/ or Mortgage Brokers will not tell you this information.

Bonnie, I am very familiar with stucco here in south Florida and without more information it is not possible to advise you properly. 

I am looking on information and advice to help me plan to purchase another one ASAP!

PS: I send a copy of the lease to them as well as a house information sheet when I approve their application, before they pay for and submit to the credit and background check.

Also, what size the floors are and what size the windows and doors are.I plan to have this information online as well, so if Suzy renter wants an area rug or curtains, she can see the size while she's in the store.Seems useful for ANY house IMO.

Needless to say, I am also new to real estate investing so my goal is to take in as much information and knowledge from the members of this site as I can so I can flourish as an investor.  

Short term, I am looking to get my feet wet, I want to learn as much as I can about rental properties, flipping, and buy and hold to gain enough information to be comfortable with my first deal.Long term, I hope to acquire enough rental property to produce enough passive income that would allow me to spend more time with my wife and newborn baby girl.I would like to thank everyone in advance for your knowledge and time in working with me.