How soon to buy baby stuff?


I am currently 20w+6d with baby. Found out the gender last Saturday, btw baby girl. I’ve been dying to know because I just wanted to be able to start picking out things already. My mom got her / outfits and my husband and I went shopping yesterday and I picked her up a few outfits. I plan on breastfeeding and I don’t have anything besides those outfits so my question is, how soon to start buying all the necessities? Breast pads, breast pump, stroller, car seat? Is it a good time to start? I do not want to get stuck buying everyone at once but either