Yenrod, if you have a computer with Windows (I forget which editions) you should have Windows Movie Maker - import the video into that and you can do most things - editing, adding titles and captions, some special effects... I found it pretty easy to learn how to use it just by playing about.
For any more technical queries, the helmetcam section is the place/
I have an ATC2k, and I've found it fine for what I want to do - not the best resolution in the world, but for the money, good enough. I've got out of the way of wearing regularly, but with a new commute, I'm trying to remember to wear it again.