Great advice here! We've got a 4 month old, so here's my take.
Consignment sales were GREAT for clothes. We have several largescale ones each year. Also, living in FL, we didn't really need much in the 0-3 sizes -- she was mostly in a diaper / swaddle in those first few months.
We use cloth diapers -- prefolds with covers (various brands) but we've got some pockets, too. We got all of them used, mostly through a cloth diapering facebook group. Speaking of which, my wife swears by Fluff Love University (
http://www.fluffloveuniversity.com/) for diaper laundering tips.
We have a Britax stroller, but we mostly wear -- a woven wrap was the easiest, now we mostly use a Maya ring sling (gotten as a gift), and we have an ergo for when she's a bit bigger.
Swaddles are good, and I strongly recommend "The Happiest Baby on the Block" for soothing techniques. Really worked well in those first few months.
Breastfeeding (for us) wasn't super easy, so getting lactation support is a great idea. We also got a pump from ACA which has been very useful. And (as was said) be gentle with yourself if it doesn't go according to plan. Our daughter was still @ birthweight after 1 month (of very frequent breastfeeding) so we ended up supplementing. At first, my wife was very distraught about this, but everyone is now doing great.
Our hospital gave us an infant carseat for free, so you might look into that.
For a crib, I wanted to go low toxicity, and we went with Davinci (which isn't crazy expensive). We also got a naturepedic mattress.
I also want to echo communicating what you want to your friends/family. I've been really impressed by how thoughtful grandparents have been with their gifts -- both in terms of thrifting stuff and in terms of getting stuff that is non-toxic.
Best of luck!