Avia has some nice features to easily test phases and transitions that do not require any expertise whatsoever as they are meant to make "problems" cleanly audible.
The rest of calibration is more on the bass management-side. For that, the Avia disk will give you some initial elements that are worthwhile.
I will let other people who did more expirement fill you in on additional stuff you can do for bass (I am one of those lucky bastard who happens to have a room with nice smooth bass, so I have not spent much time correcting!).
For the highs, just avoid flat reflective surfaces. Paintings, carpets, bookshelves on the walls can help taming fast-reflecting highs.
