Hi bobcat, and welcome!
Bras: I would be minimalist by buying maybe two supportive, comfy, regular bras that fit now. Or nursing bras, but there is no guarantee that they will fit in a couple months or that they will fit when you are nursing. It's likely that your boobs will get bigger when your milk comes in. So, with DS, I bought one nursing bra to have before DS was born in a size that fit right before my DD. A good option for this might be a Bravado bra because the sizing isn't by cup (like, 36D) but is by size (sm, m, l, xl) so they are a bit more forgiving on fit (and were my FAVORITE nursing bras by far). They would be more likely to fit now and after your milk comes in, but they aren't cheap and there is no guarantee they will fit.
For nursing tops, I, personally, despised nursing tops. I found they were not flattering and weren't very comfortable to nurse in. I preferred to wear a tank top that I could pull down (or that was a nursing tank) under a regular top for out and about, and just pull up the regular top and pull down the tank top to nurse. That way my tummy was always covered and my chest was mostly covered. I had plenty of friends though, who were totally comfortable just whipping up their regular tshirt with nothing underneath. Depends what you are comfortable with. For nursing tanks, I liked Glamourmom and I also liked Undercovermama (which you can sometimes get on babysteals.com, btw).
Ummm, I didn't do birth announcements with my first either! So, if that is disrespectful, then I guess I was!