The Pub Games that were released on XBox Live previous to the release of the game are already included on the actual game disc. There is no need to import them. You will find them in the various...
As far as I know, nope. It's all either Half-Life 2, Shadow of the Colossus. Sorry :( but I can vouch for these and say that they both deserve it. In every way.
It will autosave at key moments. However, if you would like to save in between, press the start button on your control pad. It will be one of your top options. Scroll to save, press the green A...