have you considered one of the many key fob cameras you can get on ebay? The one below is $50 and you are better trying with something like that than spending on a go-pro when starting out in my opinion.
Then there is stuff like the bullet cam pro 2 which if you shop around you should be able to find cheaper than the one below.
If you want to do slo-mo work you will need 60fps - anything less and it will look garbage. Hope that helps somewhat.