I am in the process of interviewing specialists to partner with.

I came across 2 companies that appear to specialize and build real estate and/or investment membership sites.

My question is: how much is it normal to give up when going into a joint venture?

The partner will create the site, I agree to pay a small amount up front, supply the "products" and a database of 30,000 potential buyers. I expect a 5% conversion. My side would also take care of updating the real estate products and offers on a daily basis. I have positioned the site at approximately $100-$120 per month to start. I am aware of a handful of similar sites that charge 3x my amount and lock in people for 1-2 years.

I would also like them to maintain and upgrade the site for 1 year from launch. Each time there is a new product , they put it up on the site and they receive up to 30%. Each time there is a new technology launched, for example Twitter, etc., they implement to improve sales and conversions.

My though was to offering 30%. Is that a lot or too little? Am I on the right track? Should it be less though?