You have your string in front of you, so now start to analyse and build the story. You do this by card counting and reading the triads. These are the values you use for each card:
ACES count 5.
PRINCESSES and PRINCES count 7.
KNIGHTS and QUEENS count 4.
MINOR CARDS 2 – 10 count at face value.
THE FOOL, THE HANGED MAN, AEON, all count 3.
MAGUS, PRIESTESS, EMPRESS, TOWER, FORTUNE, SUN, UNIVERSE, all count 9.
EMPEROR, HIEROPHANT, LOVERS, CHARIOT, LUST, HERMIT, ADJUSTMENT, DEATH, ART, DEVIL, STAR, MOON, all count 12.
Now to finish off I am going to direct you to some videos made by Paul Hughes-Barlow. Just Google in his name and you will see a selection of videos on this subject. Card counting and reading the string is well explained by Paul; who is a very experienced reader and has written several books about the tarot.