Videomaker – Learn video production and editing, camera reviews › Forums › Cameras and Camcorders › Consumer Camcorders › jvc everio hd620 how to question › Start with video editing
Start with video editing software that allows you to add a line of audio. About $100.
Then record the video and audio on seperate devices, like the Zoom you mention.
Then synchronize the audio in the software.
Then render the video in the software.
Then upload to Youtube if your recording doesn't contain copyright material.