Is there a how-to guide? Has valve given us any tools for the time being?
How can we map for cs-source? I know it can be done, but with any conventional tools like hammer? Is there a how-to guide for hammer + source somewhere?
You can use hammer for now and port it over to hammer2, but you will need to redo textures and entities at that point. As far as learning how just look at the tutorials out now. It should be fairly similar.