Official guides are a comin! In the mean time I would highly recommend looking through some of the examples that have been provided in the official library.
After installing the Arduboy Library through the Arduino IDE you will have access to all of the examples included in the library.
Here is the
Buttons example from the library.
Reading through the comments in these examples should be highly instructive.
One reason for no official guides yet, is the API just recently became finalize with v1.1 and we are working on v1.2 being released.
Also... search around the help wanted section, there are a couple threads very similar.