I think this KB article has most of the information you are seeking. The one caution I will give you is don't allow multiple people to work on the same individual test at the same time. This will create merge conflicts which cannot be resolved. You would have to resort to keeping the changes made by one person and discarding the other persons changes. As long as they're working on different tests within the same test project you'll be fine.
The Pages.g.cs file is auto-generated from the contents of the Elements Explorer pane. Every time you add/delete elements (usually by recording or deleting tests or test steps) this file gets regenerated. it is also generated when you open a test project. Please do not check in this particular file to SVN. Compiling the test project will also regenerate this file.
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