@Emiel Barbosa That would vary from person to person- let him tell you what he needs.  

Each area is different and will vary but I can give you a timeline on what a CA purchase may look like. 

@Lukas ParsonsConsider your end game.

Make sure you and your attorney have a game plan in court.

Rental licenses and building permits vary quite a bit by locality. 

Although the cash flow may be fine, you'll want to play the long game and acquire more units rapidly.

It’s not a bad method, but could vary according to how old everything is.

Of course, my actual expenses vary from year to year.I noticed that you mentioned 10% budgeted for property maintenance though...do you not manage the other side of your (current) duplex yourself?  

Is yard repair and cleanup fair game against the deposit.

The term in year vary from 4 to 30 yrs, and the amortization is usually 20 to 30 years.However this plan only works if you scale up fast because you need to create enough surplus in cash to pay contracts soon.