Transitioning ebf to sippy cup

Da

Any tips on transitioning ebf baby to sippy cup? I'd like her to have a sippy cup of my milk at daycare and the daycare provider would like us to start practicing. I've given her one with a little bit of breastmilk and also water but you have to suck on it and she doesn't understand :) she's never had a bottle FYI

Oh and also some advice on when to start pumping so I could have extra milk for her.