Okay, you train new Spells here, ones that you just created. You don't have to train for the spells you start out with.
E-Class Spells: 100 Words
D-Class Spells: 160 Words
C-Class Spells: 250 Words
B-Class Spells: 500 Words
A-Class Spells: 800 Words
S-Class Spells: 1,000 Words
SS-Class Spells: 2,500 Words