here are the steps to a take video with a webcam. Its pretty easy. 1. Plug in the webcam 2. Install the drivers of the webcam. 3. Open up Windows Movie Maker 4. On the left side there will be an option to Capture video from device. 5. Click on that and you're ready to go.
I haven't used webcam before to make videos, what I do is to use windows movie maker(you can get it download for free). Once you have pictures or music files downloaded to your computer you can use them more than once to make videos then download them to your YouTube account.