In my world, a partnership is based on sharing expertise and resources between two or more entities in exchange for a share of something, whether it would be a % of revenue or % ownership NOT that plus a fee. It has to be a win-win situation or it is more of a one sided agreement which will potentially cost you a lot of money, especially if he is developing your sites.

To be productive and profitable you must be able to monitor and highly influence the development but more importantly you MUST have a clear, definitive, documented agreement of who owns rights to what. You can be held hostage if someone develops your site as part of a loosely defined partnership and they decide they want more money or worse yet they want to high-jack the site and cut you out of the picture. Now this may seem to be a dire situation but I have seen it take place.

If you are the owner, you must have clear control and title to all the collateral, IP and coding. The best way to protect yourself is a good contract with set fees or partnership agreements.

Hope this helps.