The problem here is that many sellers still feel that they aren't going to get the same price listing with some website that charges low or flat fees as they would listing it with a dedicated seller's agent.

Researching AZ RV/Mobile home parks. 

You should attend the next Mobile Home Boot Camp put on by Frank Rolfe and co.Every investor and investment type is different.  

It is very hard to learn flipping, rentals, seller financing, wholesaling, mobile homes, etcetera at once.  

Brandon Turner, the co-host of the BiggerPockets Podcast will be dedicating an hour to this topic.

Maybe under further considertion you want to buy mobile homes, notes, tax liens there are many ways to make money in real estate. 

My friend told me:First, with AZ properties, there are RV, mobile, etc., and all of these types are very, very cyclical.

Regarding on time & money, I can spend what ever is reasonable and I can dedicate my weekends and nights... 

Bad Grammar and typos is the world we live in with tiny mobile devices for adult hands!

Being a good realtor requires a lot of time and dedication.