What types of magics are off the list forbidden?

What do you want to see? Do you want at least one dragon slayer?

Is there any specific techniques you don't want to see even in accepted magics?

What exactly will be our starting point so we can form our backstories around it? Do we need to be a part of the magic guilds?

Will this be related to how the prequel anime formed the guild?[@DoomFlavored]