Anyone know of the most cost-effective way to do this?

The most effective method for lead generation on the web is pay-per-click (PPC) advertising on SEARCH engines (google, bing).

If you're serious about wanting to get started, there hardly any more cost effective way to start your investing education.

Thinking I should email HOA president and demand he needs to facilitate a meeting for all concerned parties to come to an agreement, and possibly contact legal counsel?

In effect, I had a partnership, with my parents.  

Consider sending in a 9 X 12 envelope as they can't miss it.Unless you're mailing many hundreds, this can be very effective as it adds value to your service, beginning with "heads up" this us what your house looks like now.

A single member LLC has no effect at all on taxes, unless you elect special tax treatment.

He also has reduced the time I spend looking for houses by about 80%. without refucing our effectiveness or effeciency significantly. 

The right kind of development will have a positive effect on values.  

Overall this type of situation would make me nervous and I would not be excited about this rental group.Then again I don't know your market and that always effects things a lot, but in my situation I would rather wait until I found a renter I had less doubts about.