most tarot decks come with a book specific to the deck, get one of these and memorize it. i suggest taking one card each day, study it [look at it in detail, read the description in the book] meditate with the card, carry it around with you, reflect on its meaning, and write down your personal feelings about the card in question. this will help you get a feel for each card and a better understanding.
magick has no colour, only intent, so try finding a book teaching about magick in general, what it is, how to connect with it, how to cast spells, that sort of thing. to borrow from Lark,
"Before You Cast a Spell" by Carl McColman
"Spells and How They Work" by Janet and Stewart Farrar
i've read those two, very good.