since everyone else has answered most of the questions, i'll just throw some tips out there-
every time you sell a brush, ALWAYS sell brush cleaner... especially if you know it's their first brush. they NEED brush cleaner! show them how to do a quick clean between colors and explain deep cleaning to them as well.
since you're able to sell from anywhere in the store, especially in your department, always ask as your ringing them up 'is there anything i can grab for you from any other counters today?' i've sold soooo many tubes of diorshow that way! a lot of people don't know we can ring everything they need in one transaction.
start thinking about what products go together... always sell lipstick with primer. it REALLY does work. especially for bold colors. if someone picks up ladybug or MAC red, i always just hand them the primer and liner, and say 'you're gonna NEED this.'
always use fast response eye cream on your mature customers. it works like a miracle. your customer will love how it looks, and it is easier to apply color to their lids when they're slightly more supple.
be ENTHUSIASTIC! that's a lot of the reason many people come to MAC! when you get excited about products, your customers will want to know why you're so excited. it always came naturally to me, because i really do love MAC
when people ask what you're wearing, don't just say 'girl about town lipstick and bountiful plushglass'.... say, prep and prime lip, pink treat cremestick liner, girl about town lipstick and bountiful plushglass! explain all the pieces in the look, and let them know that they can recreate it.
sell lip conditioner to you customer's boyfriends/husbands. if they're standing around looking bored, give them a little swab of it and tell them to try it.. i tell them how my husband always steals mine and it's how his lips get through the dry alaskan winters. works every time!
work your personal book! get those return customers, your manager will love you. don't be afraid to pick up the phone and call your customers when we have launches. they'll be excited and feel special that you reached out to them!
always sell lashes and glue together. when people ask how much lashes are i tell them, 'the lashes are 11 and the glue is 8'. the lashes are reusable, and if i'm going to take the time to teach my customer how to apply them, they need the glue to even be able to do that!
i love working for nordstrom... it's an amazing company with lots of potential for growth. i'm having to put in my notice tomorrow and i'm very sad to go! have fun and good luck!