However, I have a really hard time calling random people I ha e never spoken with before.

Rental income is taxed on Schedule E. 

First, make sure you understand the fundamentals of the deal.

Just use the "find members" and as @Mark Nolan mentioned send them an e-mail.

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A bit about my background – UT grad, with work experience in the energy investment banking and hedge fund world (as well a few business forays including e-cig’s and e-commerce).

I set up a Quick books merchant account and you can do an e check or credit card.

Disputing everything willynilly without a sound basis will result in making it harder to get legitimate items removed later or disputing the same item again for other valid reasons as you are likely to get "previously disputed" and thrown into the e-Oscar loop where the dispute results are "verified" automatically. 

As a former commercial banker (business loans/working lines of credit; not r/e) I have given that spill many times.  

This way I can go off of the lease agreement or form 1007 (market rent, SFH) instead of schedule E since I won't have filed taxes on these properties yet.