I think a daily email would be great if you can do it. I’ve heard that one of the things about YouTube is consistency, so before you commit, you may want be sure you can keep up. If not, maybe you could pick one or two days that you will do a video for, and stick to those days.
I agree with Don re doing video. Although I love video, I don’t always feel like doing what I feel I need to, to look good enough on camera (as judged by me).
I’d say go for it, and keep us posted on how it works for you!