I am trying to support them by finding investors to assist in buying lots and financing  their construction.I am familiar with the actual development side, but not so much with the investing and deal making (that's why I'm here to learn more), when I connect a builder with an investor, what would be a fair price to charge so I am compensated for my effort.

There is variance in markets but I believe most high price markets are like my market with 2 primary plays 1) patience.

It's smart to invest now and be prepared for any market changes.  

Given the state of the stock market over the last few years, I'm looking for a way to invest in certificates to gain an interest rate higher than what banks are offering and returns that higher than the stock market right now.

Just state in your marketing or listing that the other side of the unit is rented out for midterm stays of 30 days or longer.

Using Loopnet or Crexi identify the top Commercial agents in that market for your type of investment. 

Hey All,Looking for referrals or connections to A+ STR Property Managers in the Castle Rock Lake, WI area (New Lisbon, Mauston, Germantown Township etc). My family and I are contemplating building a 2nd home on Beach ...

You can even get better with CDs and money market with no risk.  

I run a web development team and still code in web and mobile.

In todays market, they are most popular when purchasing a larger bundle, needing flexibility on a bundle (lower purchase prices being allowed for example), or when cross collateralizing equity as downpayment.