Aren't you a lawyer? Proceed accordingly.
What is the nature of your "assets"? Cash, RE, 401K (or whatever you Yanks call it)?
In the end everyone has their own preferences, so it's hard to tell you what to do. For instance, my father-in-law and his wife have separate accounts and pay for everything individually. I am not sure as to their exact arrangements (who exactly owns the house, and pays for it; whether they have agreed to pay for it jointly, etc).
Other people would find that bizarre and would want to share everything.
There is no right way. The only advice I can offer is to sit down with your spouse and discuss it - figure out what you both are comfortable with. Ideally, you would have sorted all this out before getting married.