To add a screen there are a couple of ways that I've found.
1. When on your home screen, place two fingers on the screen and pinch them together. You should then see the available screens. There will be a screen that has a plus sign on it....press it and a new screen is added.
2. When on your home screen, simply press the menu button and click on edit page. It'll do the same as above.
As far as an online manual, I've heard there was one but honestly I can't recall where our what the name of it was. That's finally one question I don't have the answer to lol