best way to introduce formula and to dry up breast milk?

Aryana • Due November 11th , 2016 ♡♡
I'm planning on stopping breastfeeding in the next few weeks and I want to start introducing formula slowly so that my newborn can get used to it and i don't just throw it on her and upset her stomach. I've heard mixing it with breast milk helps but what's the best way to do it? Like do I warm the formula and the breast milk seperatly ? The baby water is room temp and my breast milk is in the fridge... & how should I start weaning my baby from breastfeeding & start drying up my milk supply? I have about 2 weeks before I go back to work.. my baby is a month old.