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Classpect Tests
There are many Hero Title tests available, but the two I like best are thepageofhopes' and inaniloquacity's. Both of them use tests from widely accepted psychology theories as a basis.
While both tests are not without their flaws, they provide a good starting point for determining a Hero Title.
Information
My Classes Chart and Aspect Keywords posts provide a simplified overview of the classes and aspects.
InfinityWhale has an amazing Ultimate Classpect Post describing each aspect and each class in detail.
Dahni has in-depth descriptions of ALL 144 (standard) HERO TITLES! An excellent resource for understanding each mythological role.
Space and Time
Light and Void
Hope and Rage
Heart and Mind
Breath and Blood
Life and Doom
Dahni also describes the tendencies and challenges of each class separately (search her Class tag for detailed information).
BladekindEyewear has a lot of information on classes and aspects, particularly related to duality and inversion. He's basically a father of Classpect Theory, as InfinityWhale, Anna, Dahni, and many others (myself included) base their works on his class- and aspect-related theories.