I would suggest you to try and write the text that explains the product/service/site map etc... Then order a good voice over talent from fiverr (they usually take around $5 for 1 min or according to words) to record the text. After that, again on fiverr check for all the video people who make intros and so on and ask them (pm them) who can make you the movie - with moving text and so on..., that you have already the voice over and ask them how much money they want for it (how many gigs). Also, if you want it to look and sound good it's important to have a good music. For that' I'll recommend you to go to audiojungle and buy smth nice, in case you want to have all the right over the video of course. Otherwise, you may put any music you want. Trust me, whoever is in the movie business knows how to make the movie look very professional with very little effort. That's my business actually. Good luck