How do you film a reasonably impressive tv advert using a basic digital camera?

design or plan out what you want your advertisement to look like first, look for free images and or videos fo what you might need or want to add to your advertisement, have differents takes (video shots) so that you can have choices in what you would like your advertisement to look like. Use a video editing program, like Vegas for video editing and photscape or photoshop to edit pictures. Just because you think you have a basic digital camera, doesn't mean that it can't make professionally looking movies, videos, shows, pictures, posters, long as you can import the videos and the pictures into a PC and have editing programs...the possibilities are endless....epecially with all the free stuff in the internet.