I wouldn't do a GoPro as your first. They are a sweet camera but you have no settings, no viewfinder/eyecup and no clue what you are shooting. Also, the sound is horrible.
Get a cheap camera off ebay, and use a free editing program to start. When you realize it takes an hour of time to produce one minute, you may throw the camera and your computer in the woods. When you grasp the process, get a GoPro as a second cam.
I have one I can sell you if you're interested. I just got the HD one and it is stunning. However, I would go mad if it was the only camera I had.