But, if you are investing in solid C class and above, as long as you are screening properly and doing your job as an owner in giving people a good place to live, making repairs, etc, people generally take care of a house. 

I would also coordinate with property manager to start screening candidates if possible (I am not sure if that is allowed, but I would check with my PM). 

((Best)) way I can think of is have some money to invest and partner with a more experienced developer who is doing what you want to do.Come in as a Jr. type partner in the deal, and work full time at it--learning.By Jr. type partner I mean you are not calling the shots, but are in on all meetings and all aspects of the project.After a few deals maybe you want to go it on your own, or maybe just keep on partnering....A good partnership is a definite strength--but it depends on the person.I would say that is the (BEST) way to learn a particular development type.If you lack meaningful money try befriending a few developers and just talk shop as well as friendship things, and see what turns up.But to be a developer you will need to have a good sized chunk of change to risk (possibly losing) to do a deal.Good Luck!

The best way to prevent horror stories is by being extremely diligent when it comes to tenant screening!

I noticed that your screen name did not give a location.

Basically, the name of the game when you start out is to pick a market that makes sense in terms of population size & growth, job growth, demand for housing, and prices within your budget.

The bigger the ADU size, the lower the cost per square foot. 

@Jacob VosWinkel  $2,500/mo could either be a lot or not so much depending on the size of the facility and the acquisition price. 

Plus plant some fast growing screen trees

While CA may be tenant friendly, you are not required to take the first applicant and can still screen and choose your tenant.