This is a series of tutorials for getting started in Gear VR development. There is a tutorial for setting up Unreal Engine, Unity and GearVRf, that take you through to an installed application. There is also a guide on enabling developer mode and one on taking a screenshot.
Hope they proof useful to people starting out. The existing documentation for each process is *pretty good*, but for every single platform there are holes or outdated pieces of information that are hanging people up.