Congratulations this is so exciting for you 
I found that bouncy chairs were essential for keeping twins safe and getting them into position for tandem feeding.
I use the my Brestfriend twin feeding pillow and wouldn't be without it. I know lots of others swear by the Twin Z pillow too.
In the early days I had a big laundry basket in the bedroom full of babygros and vests for nighttime changes.
Bedroom was like mission control with baskets of nappies and wipes too.
We had a cot downstairs for the first 3/4 months where they napped which was easier than carrying Moses baskets around the place.
They napped a lot in their bouncy chairs in the early weeks as they were premature (born 35+6) so had catching up to do!
Accept all and any offers of help. We just said yes to any baby kit that people offered to us as well.
Try to surround yourself with positive people. I had a lot of negativity about how difficult it would be to have 3 under 2, and people can be very negative about twins sometimes. It IS a challenge but there are gorgeous moments in every day. My DS1 loves making his little brothers laugh now, it's so cute.