Double stroller for toddler and infant

Madelline

I'm searching around for a double stroller for my 2 year old and infant who's due in December. I feel so overwhelmed when I look online. I'm not even sure what infant carseat I want to get. I would really love some products recommendation or which strollers you hated. Oh and I'm not sure if this matters when choosing a double stroller but my 2 year old is BIG, he's already 40lbs.