What's the best way to make a YouTube video talking right into a web cam? For starters focus on one clear, simple idea, one topic. Don't give this gigantic speech about your solution to the whole economic crisis. Focus on one thing you want to talk about. Have a clear, descriptive summary of what it's about and then just talk.
I do not recommend that you right it all out and memorize it. I do not recommend, and this is one of the most ridiculous things, that you turn your iPhone into a teleprompter. No. Focus on one topic and maybe a few notes to collect your memory and focus you, but still, once you start, just talk to the camera.
If you stumble occasionally as I do, that's okay. Just keep on going. Your audience will forgive you as long as they sense that you're giving them interesting, relevant information that's helpful to them. If you really mess up, that's okay. Just hit delete and do it again. Because once you start editing, you'll be re-editing and re-editing, and re-editing and it just becomes a time consuming problem.
Just do another take and start from scratch. For most people, that's the easiest thing to do. Find your passion, give people your insights and just speak directly and then tell the world. You do that and you're going to have a decent YouTube following soon.