A short sales video for product website

Looking to have sales video for my website will introduce benefits of a particular product I am almost ready to sell. While I want to be speaking in this video, I would like graphics/montages/animations to anchor what I am talking about, in addition to the product. While I have a very clear idea what I will talk about, I haven't a clue about creating videos for websites which automatically play when the visitor lands on it. Bids welcome!!