any advice for doing people's makeup

Georgia

I'm going back to my hometown just in time for prom, so I was thinking i would do girls make up for prom. I've been doing my make up and watching tutorials for the last three years. I was think full glam for 20 dollars, it'd probably take me about any hour. any advice about doing others make up? any one have any money charging ideas or what kind of make up to do?