If you have that kind of cash available, I’d suggest looking at other markets and put %25 down.

I want to get a book or suggest a course about Real Estate tax law for my brother that is a tax attorney.Ideally something about taxes on small duplex/triplex investments, rehabs, depreciation, etc., and how to maximize savings and write offs. 

Its a highly regulated industry - I would suggest you consider just finding a brokerage that will work with you - there are many.  

If you want to find a mentor, then I'd suggest that you get out there and start making moves. 

Any suggestions on what to look for when doing my underwriting.

One post I found suggested that pulling county records would be the way to go.

I like the consulting fee suggestion. 

Strongly suggest you to use the BiggerPockets Calculator as well as look into Lease Options as that might be another exit strategy to save on the repair, hoa, property manager costs. 

Does anyone have any suggestions on how I can quickly build my buyers list so I can start moving properties?

During the inspection they did not find anything to suggest that the foundation has issues (i.e. no issues closing doors, cracks in walls, windows not working.