Mine are still too small to be worn in a carrier but I tuck them inside my tank top when sitting or laying down.
We have a hand me down rocker which we haven’t used yet.
We got the Graco Pack N Play twin bassinet set. I wouldn’t recommend it though. It’s big, bulky and difficult to bend and get the babies out if you have a C-section.
When they are little, you can wear them in a moby. Of your budget allows, the weego looks awesome, but I didn’t hear about it until mine were too big. Also a minimonkey. Now that they are bigger I either wear them in a woven wrap or a Twingo. I definitely prefer the woven wrap but there is a learning curve. Check out the tandem babywearing Facebook group. Lots of good info and people also sell used carriers on that page. You can also look for a local BWI group to get help with carriers.
Mine have slept in a crib since day one. They shared one until they were about 5 months and started kicking each other. I have a twin pack n play but it sinks in the middle and it’s too big to fit through doorways so not easy to move around.
I have a regular rocker but only ever rocked one at a time.