329903 Requirements Doc Development

I have a user name and password of a website I would like to replicate. The first step would be to develop the requirements document based on the website. This would include, but not limited to data structure, features, tools, values, etc. This will become the starting point for us. After this is complete we will have a second phase where we compare some additional requirements and review how the new features and our current mis data structure impacts this project. I mention this only because it will not end up a exact copy. But for this phase of the project we require a detailed design document based on an existing user logged in database driven website. The site as I see it has been written in php and sql.