How you would apply at Sephoras or M.A.C. and what kind of experience you would need to obtain a job there?

is it just like free lance make up artist that apply or what?How you would apply at Sephoras or M.A.C. and what kind of experience you would need to obtain a job there?
Well I heard that you need to have experience with make-up. Like going to make-up school 'n stuff.