There's two types of magical girl worlds.
Dark and Light
You must be careful about which universe you want to bring into ours through your magical girl transformation.
If you were to base your magical girl on Magical Girl Site, you'd be bringing those Villains into our world and you have to be sure you can control them otherwise you could bring our world to doom.
Same with Madoka Magica or Magical Girl Raising Project, or any other dark magical girl media.
You have to be careful or you'll end up costing not only your life but others.
So think carefully on what you want to base your powers/universe off of.
You don't have to base your universe off of another one, you can simply make your own. But if you do base it off of one, be careful and think hard before you do.
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How to Become a Magical Girl
Non-FictionThis is a tutorial all on how to become a real life magical girl.