1. Some of the spells work, some of them don't. A spell to bring positive energy into a home could be effective; a spell to make someone grow wings would not.
2. Anyone can, as long as you've learned about magick and know how to properly cast. I would recommend reading and learning more before casting.
3. The best spells are debatable, I suppose. I wouldn't say there are any "newbie spells," to be honest. You're either ready to cast or you're not. However, I wouldn't recommend starting with anything that could potentially hurt people if miscasted (for example, a curse could end up having unintended consequences, such as backfiring on the caster).
If what you mean by "wind spells" is controlling the wind, you're out of luck: almost any serious witch considers weather magick entirely fictional. However, you could draw energy from the wind.
Well, as I said, spells will only work if you know how to cast. If you're new, as you say, I wouldn't recommend starting with casting. Check out the Featured Articles section and read some of the pinned forum posts for some of the basics, and start looking more into things from there.
Besides, without knowing what sort of spell you need, it's a little hard for me to find one for you. Also, spells written by the caster have a tendency to work better anyway.