Animated Video 120 to 180 seconds long

I would like to show in an animated video how my technology works. I have some images that are already created, so maybe they can be altered. If not they can be used as ideas. This is a video that I would like to post on my site, so would want an instant upload when someone got to the site. I don't want them to have to wait for buffering. It must look clean, very professional. It can be done with background noise or effects. If we do use a narrative I will supply the script and we will hire the outside voice, but you need to add it to the video. The outside voice I will pay for on my own. I believe we can show the video as a before (without my technology and one as an after with my technology). I do have an example to show you for an idea. The length probably be 2 to 3 minutes.