For earth magic, you could always just visit the [url=https://blackclover.fandom.com/wiki/Earth_Magic]wikipedia[/url] and check there. Just keep in mind that, typicall in Black Clover, magic is very specific. Like, "earth magic" doesn't incorporate every aspect of things found in the earth or ground. Metal, for example, is a seperate type of magic from earth, as is sand. So the first thing you'd wanna do is decide what "kind" of earth magic you want.

As for backgrounds, that I can't really answer, as that's a big part of your character that [i][b]you[/b][/i] need to decide on. But typically, people belong to one of three major "groups".

- The nobility
- The commoners
- The foreigners from Hino (Who're essentially Black Clover's version of our Japan).

I hope this helps in some way.