I recommend reading up on how video works and common editing techniques before trying to learn editing software. There are numerous books out there, including textbooks by Herbert Zettl and Ronald Compesi that are very comprehensive. This is pretty much how a college class would introduce it, and you'd get the info without easy access to the hardware.
Once you've got a little bit of knowledge, you could play around with iMovie to get some of the basics. I recommend getting a camcorder though. You're going to need some footage to experiment with. I don't know of any specific schools in Arizona or how much they would cost, since my video production training came via university and then work experience. I would expect at least a moderate investment of time and money to get up to speed.
When you get to that point, look for internships at local TV stations, even if it's just getting people coffee. It's the only way to get professional experience. Good luck.
