I'm happy to answer any additional questions as best as I can. 

You will need an additional $300-500/month budget for capex.

Additionally, most servicers will provide the tax documents needed at end of year (1099-INT, 1098-INT) and can also issue notices of NSF, late payments and support delinquency /default.

Duplex have different zoning that may permit additional units.

In addition, due to the 2 of 5 year rule there often is no need.  2) you cannot 1031 a property that has not been put into service to be an investment property 3) you cannot 1031 a flip.  

In areas with rapid and sustained appreciation, you can use the equity gained through appreciation to purchase additional properties.

Additionally, take some time to drive around your neighborhood and gather information on recently sold properties within a mile radius.

This doesn't replace the need for a MSA that will capture additional clauses needed on a Contractor-SubContractor relationship, this is just a project specific form you would use in addition to the MSA (prepared by your Attorney):This template is for informational purposes only and does not constitute legal advice.

That is the only update I can provide today.

They originate 5 year interest only notes for buyers of turnkey SFR properties working through a network of turnkey providers.