how do you get makeup for your avatar? I am VERY curious about this...

You can buy it at the grooming parlor: things like lipgloss/lipshine, eyeliner, blush, bronzer, etc. You can also buy it in user shops if you do a shop search. :)

You can buy some from the main shop, or from user shops. There are makeup kits that are quite expensive or some makeup is included in some trunks.