The 1080p could be viewed on an HDTV, or a computer (I would venture this is more common these days)...if you are asking if a standard def TV would work - If you plan on using this with a standard def TV, the process would be as following:
Using a computer, apple/mac it doesn't matter use video editing software to publish video to DVD (save it as a DVD)
When you save it, choose a standard def option (640x480) - it will likely make you do it in letter box format.
The letter box will happen because you took a rectangular image (1080p) and published it to square TV output.
I would say most people publish their videos to sites like youtube and other people view them on phones/tablets/computers more than anything else these days. Heck more and more people's TV sets are basically simplistic living room computers anyway (seen what a blue ray player can do these days?).
I know they have the integrated software red filter - use the external one you bought - that's my .02.
As to the head mounts, I think you will find you move your head more than you think you do. I use mine on a tray, and am happy with that. There are lots of options out there...heck just starting off you may just want to use a coil lanyard and clip it to your BC and hold it to shoot. Whatever you do, make sure you secure it - people lose small cameras regularly...sometimes it's many minutes before they realize it's gone.
Or maybe you really do want that whole 'point of view' shooting. I don't care for it, but people certainly do it a lot. If you are showing the video to others you will find your self saying this is the part where I became a bobble head for the next 15 minutes.
I would look into a 32gb card for memory - unless you are sure you want to download video nightly. I want to say 32gb would hold 5.5 hours on mine. Downloading video nightly isn't hard, but I work on computers all the time and rarely want to open one on vacation. That's something I'll do back home in the real world.