If so then passive rather than active investing will be key and that takes you back to the classes of passive opportunities using them to pay bills while you develop your next "thing".

By what are those key things that a first time landlord should know.

From everything I've read and heard, having the proper systems set up when first starting out is key.

These are actually key factors why we choose to live in that area.

You bought where the numbers made sense and you made it work.You know how many people are sitting at their key boards stuck in analysis paralysis trying to control every single aspect in a deal and making every excuse not to go through with it.Once again I commend you in your actions.  

Having a supportive wife is key :).

If you are looking to buy a turn-key MHP, I would recommend researching and determining the area of the country you would like to invest in and then locating a MHP Broker in that area that can assist you in locating a park that will fit your criteria. 

Housing can be influenced by their labor and business decisions.

If you can get them to execute a DIL then offer cash for keys and have them exit the home (hopefully) in a peaceful fashion We usually don't make the CFK payment until they move out and we get a local agent to inspect the interior. 

Be aware... many turn-key providers are selling homes above what they may appraise for and you may have to bring even more money to the table to close the deal.