Hi Michael,
First download the template that the project was created with MsAgile or CMMI. You will need the documents to upload if you want them.
You can create a portal from the Sharepoint Admin website. Start->Administrative Tools->Sharepoint Administration
Select Create a Top-Level Website
Select Default Website
Select Web Site Address and name it the same name as your project. The Url should be under sites like this:
http://<Sharepoint_Server>/sites/<Project name>
Navigate to the newly created site and select the template that you created the original project with (VSTS_MSAgile or VSTS_MSF_CMMI)
Connect with the Team Explorer. You can upload documents to the appropriate folders from the template that you downloaded. Let me know if you have any problems.
Thanks,
Brad