Google AdWords help!!

[niceties55]

I am new to this AdWords thing and I was thinking of using a $100 free advertising coupon (when I spend $25) and I had a couple questions about this:

1. Where are some good tutorials to watch or read that explain how to use AdWords?


2. How long will this in essence $125 worth of advertising credit last (in general)?


3. Is it even worth spending the $25? How would this help me?


Thanks!!