Mark's points are right on, Mt1, especially the one about learning to separate the good information from the bad. Unfortunately, it is sometimes difficult for a beginner to know how to differentiate between the two. I agree that there are a lot of videos (and audio tapes) that will give you fundamentally sound information. Having watched a bunch of them over the years, I really couldn't say which I think are better than the others, so maybe the best advice is to get the ones that are on sale!
One thing you should be aware of, though, is that all turkeys and all turkey hunting regions are not created equal. There are five subspecies of the wild turkey in the U.S., of which four are hunted in significant numbers. Although they are all fundamentally hunted in the same way, there are variations in the optimum hunting methods you use depending on the subspecies, where you are hunting them, and the timing of the spring season you are hunting them during. For example, the best calling and hunting tactics used for hard-hunted Eastern birds in Alabama at the end of their season are not necessarily the same as those you would use on lightly hunted Merriams in Nebraska at the start of theirs.
The point to be made here is that you might want to match up the video/audio information you get as a learning aid to the subspecies and region that you will be hunting in. If you live in south Florida and will be hunting Osceola's, then you would be well-advised to find a video that features hunts and hunting tactics that apply to that region and subspecies.