I have developed this passion for real estate investment mainly fix and flip.

My brother has quit his full-time job and now invests full-time while I partner with a local real estate developer to further our knowledge in the commercial realm."

Also use Google search the same keywords and city you are targeting. 2 I also use a software program that finds cash buyers.

When I manage or develop a project there is always a "development" or "project management" fee.  

The software doesn't seem to allow me to edit that. :-)

He has mentioned that he would like to use his capital %100 and hire me on as Business Developer and essentially pay me a salary with a percentage on each deal.My questions are, What should I limit my duties to?

We work with real estate developers and hard money lenders who want to get more deals funded quickly.

Or developers who have sound proofed before. 

So I've been studying the state of the art, best tools & practices in Property Management, especially curious about Work Network development and proactive, preventive maintenance.What I've been surprised to discover is that the best PM platforms are full-blown accounting systems, designed to replace the likes of QuickBooks which has been so popular for so long.The thing I'm wondering is, if real estate investors are well diversified, they're probably doing a lot more than just investing in real estate.  

I'm an Architect with experience in residenital/commercial design and development.