I also agree with the suggestions for Joan Bunning's "Learning the Tarot." Her book (and online course) give the best, concise keywords for each card, but also include wonderful exercises to help tie those key words to your experiences with the cards.
In addition to using a beginner's book, the next best thing I can recommend while starting out is to do a Daily Draw, drawing one card per day. (You would ask something like: "What energies do I need to be aware of today?" or "What energies will I be working with today?" or "What energies should I work on today?" and you get the picture!) Draw your card, look up the traditional meanings for that card to see what energies/experiences are tied to it, and watch your day unfold and see how the card's energy fits into your day. To *experience* the cards in this way will teach you so much more than a book.
Also wonderful books are Rachel Pollack's "Seventy-Eight Degrees of Wisdom" (already mentioned here), and Mary K. Greer's "Tarot for Your Self."
And I would suggest starting off with a deck that is a little simpler in imagery. I too started with the Medieval Scapini (or at least I tried), but I didn't last long. It wasn't until I purchased a "learning" deck that I was able to tie it all together.
Good decks have all been mentioned in the above thread. For me, instead of purchasing the RWS deck to learn (couldn't stand the colors), I used the Universal Waite. If I were in that same situation today, I'm sure I would use the Radiant Rider deck. (I like vibrant colors!) I have also used the Robin Wood Tarot in a reversals class I took, and it was wonderful. Almost all of the cards are so similar in illustration to the RWS, you will hardly notice a difference.
Of course, the imagery is pagan as opposed to the Christian imagery of the RWS.
Good luck!
Blessings,
Karen