My best friend's grandma always told me that Ouija boards opened a portal to evil spirits and playing with Tarot cards would summon demons... She also thought Firbys were the devil.
However, her fear only furthered my curiosity. I've been playing with the Ouija board, obsessed with horoscopes, and shuffling Tarot ever since I saw The Craft and The Witches...ill admit I desperately tried to cast spells on my babysitter as well.
It wasn't until I actually studied these "crafts" this summer that I understood how these things are meant to be used, especially Tarot. While taking the bazaar class "COLT 101: Intro to Fortune Telling" I learned the rationals behind the folklorist traditions.
Ultimately, it comes down to intuitive story telling and some good ol' studying. Each of the Tarot cards is packed full of unique symbolism. Once you memorize what the cards stand for, it is easy to make up stories within the random combination in which your subject arranges them.
Example:

The "devil" represents a foreseen lack of power and control of your situation due to ignorance and lack of self-awareness in your actions.
The "fool" represents a childish perception; pure and innocent, trusting and fearless. A new begging and potential. The fool is on the edge of the cliff, this signifies confrontation with risk and change.
When you put the two together, although they can be interpreted countless ways, they tell a story. If you were doing a reading you could say something like this, "You have hit a turning point in your life in which you must regain your power and awareness in order to take the risks that will lead you on a new path of success."
Fortune telling using Tarot can be entertaining but I have found that the cards are best used for brainstorming. When you think of the cards as characters, plot, conflict and setting it is fun to try out a number of combination and let the imagination take over.
Use this technique to jump start the creative process. Whether it be a story, project or half-baked idea, I guarantee it will push you to think in a new way and help to create surprising outcomes.