We have installed TFS 2010 with success but wonder how to set the users permissions. We are small projects with five developers, a manager and a secretary. Each developer is
For detailed information about TFS 2010 permissions you can check this http://msdn.microsoft.com/en-us/library/ms252587.aspx
If you want a user to be able to read the source code you have to give him/her only Read permission and to prevent him from changing code you have to deny check out and check in permissions. You can set these permissions by right clicking the folder or file in Source Control Explorer, Clicking Properties and clicking Security tab.
For Work Items you have to give WORK_ITEM_WRITE and WORK_ITEM_READ permissions. You can do by right-clicking the project in Team Explorer, clicking Areas and Iterations, and on the Area tab, clicking Security