Tags: questions about setup

[HippyCraig]

I am working on my first Realm, and I am not sure how to proceed with some tags. I wanted to create tags for spells that I entered into the system so I can easily search and find them. I haven't assigned any of these tags yet as I am not sure what the best way to go is, currently I have this:

Spells (As a Domain)
Level 0
Level 1 ...
Level 9
Bard Spells
Cleric Spells ...
Wizard Spells
Material
Somatic
Verbal

The ... means the others are listed in-between I just didn't list them. Should I have different domains for Spell Level, Spell Components, Spell School. Or should I have one domain for all the tags like above but maybe add something in the front of the tag like this:

Spells (As a Domain)
Level: 0
Level: 1 ...
Level: 9
School: Bard Spells
School: Cleric Spells ...
School: Wizard Spells
Component: Material
Component: Somatic
Component: Verbal

Looking for some advice on how to proceed, I don't want to go back and redo anything. Is there a way to make sub domains? Did I miss something?

Thanks
Craig