This is not a legal opinion just a personal one. 

LVR restrictions on any property that is not your home, very low yields, high building costs, median house price in AKL that is over $850k.No building depreciation, and government that is introducing pro tenants laws... 

The exact nature of your legal situation will depend on many facts not known to me at this time.

To assist in finding homes for flip or rental properties.My question is, would it be legal for me to provide specialized emails (Home photos, ARVs, rehab cost estimates, profit estimates, etc) to my investors highlighting potential flip properties and then requiring that a marketing fee or finders fee is to be added to the initial purchase price of the home If they decide to flip a provided listing?

The numbers:Purchase Price: $28,500Equity: $49,000 (No Appaisal) Comparables are 45k and 53kFinanced: $0Improvement Costs: Projected $2,500 on tenant turnoverProperty Taxes: $700Insurance: $900 yrProperty Management: $58.33 monthlyVacancy Rate (7%): $42 monthlyRepairs: $360 yrHOA: $420 yrCAPEX: $144 yrMisc/Legal: $349 yrCash Flow:  $204 monthly Rent: $600Cash-On-Cash ROI: 9%Shoot me a pm or leave a comment if you have any questions or remarks!

@Alex Fabiano, in most states you must be at least 18 years old to enter into a legally binding contract without parental consent.

If no will then they'd have Letters of Administration.Either of these documents would give the children legal capacity to sell the property.If probate has yet to start, then maybe you could buy out the children's legal interest in the property and start the probate process yourself.  

Are there any legal obligations?

Would partering with a real estate agent make the process legal?

I’m still doing research on the legality of an assignment fee to a realtor.Do you wholesale as well?