please help me 😳

Hello all I'm unsure when to start buying things for this pregnancy 🤰 I am 6 months and pregnant with twin boys, this is my third pregnancy and I'm a little out of swing with when to start shopping for things. First child is 7 born at 40w 1d second child is 5 born 38w 3d. My doctor already gave me an induction date of 10-4-17 but my due date is 10-18-17, when should I start shopping? 🤔🤷🏽‍♀️