There are some ghosts in the generic NPC thread. If you set it to print and search for Spirit Form, you can find them easily enough.

There's a Spirit Form rework on the wiki, but I'm not sure if it's any good.

If basic ghosts feel weak, why not have the ghosts be of people who would've been serious threats in life? A wizard ghost can probably still fireball you.

First of all, you'll want an Aspect. So you can spend a Fate Point and get some random logical benefit that you wouldn't think to include in a Power.

It basically sounds like an Item of Power. Perhaps granting a Supernatural Sense, if it basically serves as another pair of eyes. Or you could dig up this old custom Power and try something like...

Item of Power (metal owl) [+2]
  Projection [-2]
  Limitation (only for the owl) [+1]
    Wings [-1]
    Diminutive Size [-1]

That works out nicely to 1 Refresh. But as always, Powers like these are an at-your-own-risk kinda thing.

If I understand correctly, Quetzalcoatl was a god of the sky and of knowledge.

So perhaps air for evocation and a mixture of air magic and divination for the thaumaturgy. And for the special extra...maybe Wings? Using an existing power is a bit dull, I guess, but it really seems to fit.

Been a while since I read that book. What exactly did the spell do, again?

Unfortunately, I know nothing about that portrayal of John Constantine. I know a bit about the character in general, but only a bit.

I can take a crack if you tell me more.

What I've listened to seems good. I don't really have any great desire to watch introductory content though; I do know how to play this game.

If you want a specific suggestion...I think you might oversell what a Superb rating in a skill means, but that's a minor quibble. And it's likely worth mentioning the 1-3-3-3-3 skill pyramid at Submerged.

In general, there aren't hard rules for this sort of thing. You can play without even making Locations and Faces; the guidelines in the book are just one reliable way to build a solid foundation for a game.

1. It's generally a good thing if an Aspect has many and varied possibilities. Not actually a problem if some Aspects are pretty much all good or all bad, though.

2. A classic example is ACCORDED NEUTRAL GROUND. Sometimes it's convenient for you that a place is neutral; other times it's a problem. Good if you want to arrange a nonviolent meeting or get the Unseelie Accords involved; bad if you want to attack someone there, or want to avoid the Unseelie Accords at all costs.

3. It's describing whatever you think is important about the location, whatever you're likely to invoke and compel.

4. It's fine if a Face's HC has nothing to do with their Location. If you look in the back of YS, many of the Baltimore Faces have unrelated HCs.

5. The Idea is usually a longer, clearer, and less evocative version of the Aspect. The Aspect boils down the Idea, basically.

6. A single Face isn't gonna express everything about a Theme and doesn't need to. They just need to bring that theme to the forefront whenever they're a major presence in a scene. For example, a corrupt mayor could serve as the Face of THE CITY IS ROTTING if interacting with him makes the city's rot clear.

Everyone has a rating in every skill.

Beast Change can totally raise skills from 0 or drop them to 0. In fact, from a character-optimization perspective, that's usually the best way to use it. And as you point out, it makes a lot of sense for many skills to become 0 when you transform.