first off. youtube is the worst possible choice for uploading a video (if you're going for quality in the video. if you're going for more views its the perfect place)... i dont know where the best place is, but vimeo seems to be a good one
secondly, the best lighting to film is when the sun is in the riders eyes.
thirdly, the quality of the camera will also determine how good the quality of the video will turn out. if you're dropping a couple grand on a nice camera it will show.