The best I can help is that the choosing happens first, using the cards of the suit named in the adventure, and each PC gets a bonus against an NPC depending on what their card is. The main reading, using the whole deck, is a way of either foreshadowing the adventure or guiding a derailed game. As for the points I'm abit in the dark myself, as I don't have my books on hand. The sidebars will prob be your best friends during the harrows.