You are far more likely to find a mentor through in-person networking and building relationships.

There is a lot to know about owning the pad vs. land and the build of the mobile home and whether an end buyer can get financing on it.

I'd also network with other Realtors to identify clients relocating to the area looking for temporary placement while they find or build their new home.

But when I have an appraiser come back with comps from a year ago from when I purchased the building and then they refuse to recalculate based off of recent comps, I'm not going to be interested in working with that person again.

They'll go direct to the listing agent just as they often do with new build properties.

Taxes and ROI are much better in Oklahoma.

Building wealth should be a priorty. 

Quote from @Gash Nookala: David has the right idea about building a team, but the most important player on that team is the property manager.

For one property, a spread sheet to track income and expenses would suffice to hold all info for your tax professional at the end of the year. 

On the flip side, mass transit can help with the car issue and water/sewer upgrades can help with the utility usage.As far as single family versus multifamily, usually multifamily is taxed higher.