
OK. So the form and detail of the spellwork would depend on what "spell tradition" you were following - if any.
Quoting Barleywine here from the thread 'have you ever used tarot cards for spellcraft':
"Donald Tyson wrote a book on this very subject.
http://www.llewellyn.com/product.php?ean=9780738709802"
I read it some years ago and still have my copy.
2 other books that come to mind are "Magick and the Tarot" by Tony Willis (don't have this one) and "Tarot for All Seasons" by Christine Jette (do have this one and it's Wicca based).
There have been some other threads here on AT on the subject too.
Now, I'm Wiccan - and so I post here my own personal format for spellwork based on a Wiccan format which includes creating a magickal protective circle to perform the spell within. (N.B. it's not always quite as detailed as below).
I have 3 designated tarot decks for spellwork - Barbara G.Walker Tarot,
http://www.aeclectic.net/tarot/cards/barbara-walker/
The Tarot of the Cat People (by Kyukendall),
http://www.aeclectic.net/tarot/cards/tarot-of-cat-people/
and Tarot Therapy Deck.
http://www.philipcarr-gomm.com/tarot-therapy-deck/
(Pagan Lenormand also looks like it may end up being a ritual deck).
I actually didn't do any special 'consecrating' rituals for them - just decided they were the spell decks, and don't use them for anything else. They get the whole dedicating mojo thing everytime I use them in ritual.
RITUAL FORMAT

N.B. Before I begin, I will have decided what I want the spell (or prayer if you like) to be about, and chosen the cards, other props, and chants that I will use. I may have chosen a particular card to represent each of the 4 elements, cards to represent Deities if I'm including them, and cards that represent my wish/intent.
1) GROUND myself (I do this with a mantra or visualisation of roots into the ground to draw up earth energy).
2) EMPOWER myself (I do this by chanting a short spell which affirms that I am gathering magickal power
- or it can be done by extending the grounding meditation to include extending awareness up into the heavens where "all souls meet" and imagining the energy of the Universe going down through the top of my head to meet with the empowering energy of earth. One can visualise being suspended "between heaven and earth" in this way. Chakra imagery can be added with these energies meeting at the heart).
3) PURIFY myself, my tools and the space (with sprinkling salt, incense, clapping my hands, visualising white light, ringing a bell... etc. etc. etc.)
These three steps can be covered by performing the LBRP - lesser banishing ritual of the pentagram and versions of it - from the Golden Dawn.
4) CAST the magick circle, (I draw it - literally or imaginarily. I have a little chant when I draw, asking the spirits to protect the circle, and visualise it flaming with luminous protective light when it's closed/complete). I have a Wand and an Athame - but I rarely use them for this if I'm on my own. I'll just point with my fingers.
5) CALL the quarters (or quarter spirits in whatever form I've chosen). Here is where I will lay down a card for each quarter as I call/welcome it. Then call/invoke the appropriate Deities whilst laying down the chosen cards for them in the middle of the circle.
[*N.B. I am rather pleased that my ritual format summary is in a set of 5 - mirroring for me the 5 points of the Pentacle, a popular symbol of modern pagan practice. This symbol represents the 4 elements and the 5th - the spirit/aether/ - encircled within the will of the magician/witch/spellcrafter, or contained within the infinite circle/mystery of life.

]
THEN I do the magickal spell that I have planned using the tarot cards I’ve chosen...
I'll sit in the middle of the circle I've drawn and meditate on my intention looking at my chosen tarot cards and chanting a previously written spell or just sitting in silence.
TO END - I release the circle, by saying goodbye and thank you to Deities, quarters and spirits. And declare the circle open. I will draw the circle counter-clockwise to open/release it, i.e. drawing it in the opposite direction to how I first created it.
This end - can all be thought of and embodied, within the act of blowing out the candles that have been lit at the beginning of the ritual, if they have been included.
I may use one or two tiny tea-lights in appropriately coloured holders - or I may just use my coloured LED bed lamp (partner is paranoid I might burn down the house

).