The best leads we got from Zillow was from people who were inquiring about our own listings (which our broker paid Zillow so we showed up on our own listings). 

Any recommendation on the type of insurance and the company I need to inquire about covering something like that?

I became a PENFED member to obtain a HELOC, however after inquiring more they don't do the investment and they also have a limit to the number of properties you can own.  

In order to save time, you should definitely try and pre-screen the people who inquire about the property.

So I inquired about this corner abandoned house, and I just got word that it has been rezoned for a duplex. 

I request an email I can send our "tenant profile" to and get that from about 80% of people who inquire.

Even if you're calling to inquire about buying something from a recipient of a phone call,  technically you might still be acting as a telemarketer and may be subject to the TSR and DNC list. 

As a former syndicator and 1982 National President of the Real Estate Securities & Syndication Institute I have personally witnessed to many horror stories of well meaning folks trying to raise money from investors without good legal advice.Be sure to contact a good securities attorney in your state to inquire about small capital raising exemptions which are not too difficult to comply with.I recently got a private letter ruling from my state allowing me to bring in one limited investor without having to file anything with the state.

My agent is inquiring about getting some more details.

If I am a lender and I search your name I will see that you are inquiring how to commit fraud.