Congratulations. you will love every moment with it.Well I am not sure if there is a manual.But its pretty much straight forward.Here are some important points to remember:
1. Do not use ezdok.Just disable it in exe.xml file.
2. Always launch with the FlyInside P3D file than the regular P3D file.
3. The settings that you have for the regular P3D wont carry over to the new file.So you can adjust it later on.
4. Once you launch the flyInside p3d file, you will be asked to use a joystick button as an interactive button. This is a button through which you can select a menu item or button once your occulus pointer is on it.
5. It takes a little more time to load.So do not panic
6. Enjoy the immersion