How do I add magic?(newbie help)

So I've basically got that covered, but now my problem is on how to arrange the spells. Do you know how to help? :3

Basically spell IDs 0-23 are attack spells, 24-44 are effects spells and 45-53 are white spells. This will remain the same regardless of what you change in the spell data, meaning their order and spell icon will follow what is hardcoded in the game.

One thing you could do is swap spells, but its spell ID might be hardcoded at multiple places in bank C2, meaning you got to change the corresponding value(s). The list would be way too long to enumerate here.

If you wish to modify the magic order (which spell is in which category), you can check the code at C2/55BA to C2/55D5. By modifying the CMPs values there you can ajust at which spell ID you black magic will end, as an example.