I have looked into this quite a bit myself. There are a few courses on creating
infomercials but I haven't found anything I would say is "the thing to check out"
Maybe I could point you in the right direction if you gave me an idea of what kind
of product you're trying to promote?
Are you actually trying to get it on TV? Are you just doing an online video for your
product? Are you sending this video to prospects? What's the goal?