I'm going to shave my head. How do I do it? How do I take care of it?

I’m going to shave my head this weekend and I’m not sure what all I need to do. I’ve read some articles so I know to cut it really short first, but what kind of shaving gel do I use? And do I need aftershave? Will I still wash my “hair”? Or will I need to get a specific type of cleanser? I have some dry spots on my scalp already. Will they look really bad? Will they get better because of this?