A Template to assess a SharePoint environment after Transition?

I am involved in the process of SharePoint transition of one of the clients to our company which was being managed on their own so far. Now that I have been part of the KT and now I need to prepare an assessment document on the environment including the impact we can bring in for them.

Now my actual requirement is, could I request you all to provide me a template probably that I can use to prepare an assessment report or the sites where I can get any of the templates to suffice my requirement?

Thanks in advance. It would be of a great help, if someone could help me out on this asap.

Regards GSB