If you're technically challenged like many of us I would recommend going with one of their basic models, fewer bells and whistles. Some of this stuff is just so far advanced that we/you would never use some of the features. Consider buying from a store i.e. Best Buy, etc. where they can give you a demo. YouTube has a lot to offer also in the way of operations.
The mounts for attaching to your helmet are extra and usually offer a variety of locations. Mine is on the lefthand side as I experimented and found that to be the best. Anywhere on top is open to brush and possible loss or damage. Make sure you use a tether so if it comes lose from the helmet, it will still be there. The tether should be included with the mounts.
I tried various options for START RECORDING. You don't want the thing running all the time, the batteries won't last. Some can be activated with sound, others with a remote button on your glove, or a switch on the camera itself. I chose the latter, others were too unreliable.
In reality, what you record is not very exciting. Endless loops of trailriding may be great for us living the moment. Once recorded it becomes a bit tiresome. Just being honest here. Highlights of wildlife, captured scenery are rather seldom when compiling the video.
You're halfway there. Once recorded on your camera, you'll need to edit the content. This will require a program which cost me as much as the camera. There may be less expensive options/even free but your finished product will show it. I chose Cyberlink which offers some great features. You can buy it at Best Buy or On line at various levels of production. Another word of caution, it takes a lot of patience and practice to master the program. The raw video from your camera is just that. To make it presentable as something others would enjoy will take hours of editing.
My first few times out were all failures. Either the camera was aimed too low, too high, too far left or right, very maddening. I found that I would have close to an hour of vid to make just a short film to share. To share with others, you'll need to upload to YouTube which is another challenge. This is the reason that I haven't produced anything in a few years, it got so darn difficult to upload due to YouTubes requirements that I chose to avoid it entirely.
I hate to disuade anyone from enjoying a new pasttime or hobby. I enjoyed the video portion of this a lot but it was a challenge mastering all the technology and I'd hate to see someone put a lot of money into something and then find out they're not able to master and enjoy it.
Good luck with your plans and adventures. The Cameras are good for all seasons and events once you master their usage. The following is one of my vids from a couple of years ago. This was probably at my peak of experience and editing skills.