Look for books published in the last 2 years as some of the books post 2010 seem to give people unrealistic expectations.

Very little cash flows at 7% interest with houses that have doubled in price over the last 5 years.    

We have been working with Devon Kennard and helping him expand his portfolio over the last several years.

@Polat CaglayanI've never seen a formula but here is a general rule of thumb for multifamily:The class of an apartment refers to the quality of the building, which can be determined by a number of factors, including age, location, and condition: Class A: These are the highest quality apartments, typically built within the last 15 years.

As a last question, Juan Pablo asked when did I think I'd be ready to start, I said within 90 days.

I did this again last year with a paid off property only cash flowing me $1200/month.

The last one, Realty 411, is a completely made up magazine.

Lastly and then I will stop rambling... and this is just my opinion. 

I am from California, but lived in Peachtree City, Georgia last year (renting), and currently live in Germany as an Au Pair.

Id need to read up on this last part to confirm, but that's what im drawing from memory at the moment.