My main questions for starting out would be if I should I go with multi family or single family and should I go class B or class C properties?

Also, it has been my experience that it is absolutely necessary to check the website every single day for the property you're interested in.

They are rabbeted in the very best tradition of foursquare work, and each of the 4 and 5-inch quartersawn trim boards has a wide single groove dadoed into its back (modern production trim boards have 2 or 3 narrow grooves, it's cheaper to do but doesn't work for trim quite as well).

That first property has generated a pretty decent cash flow, and we just closed on our second single family rental in March 2018, located in Wake Forest, NC. 

Looking to do buy and hold  investing on small multi-family and single family homes where there is value add.

To answer your question: you should consult with an incorporation attorney to determine if single vs multiple LLCs are right for you as far as mitigating risk or other issues.Congratulations and I wish you nothing but success, Spencer.

If you can do it for a single family, you can do it for a duplex.

Too risky to trust your money to any automated system.The sales comparable approach to value will dominate regardless of cash flow if it's a single family home or 1-4 units and is being financed. 

I am looking at getting into rental properties both single and multi-family.

After that, I am undecided on multi vs single family, but have a feeling that multi will dominate, as I am always looking for bigger and better.