I took many months before I used stroller. I mostly used infant/newborn carseat and my wraps. The stroller I purchased was a really old maclaren volo that doesn't recline or has a hood to it. Not ideal at all. My second stroller was one of those jogging type strollers for 2 kids. That one reclined. On rare occasions I still use it (my kids are 5 and 3.5).
I purchased the infant carrier (aka baby bucket). My kids slept in them on occasion. One kid I was ok with waking up in the middle of sleep. The other one was a nightmare if I did so. You'll figure it out. Not sure if that's helpful.
As for carriers this would be my first time trying an ergo on an infant and I'm looking forward to it. I used pouches, ring slings, and moby/didymos wraps on the other two. They were ok, but I got really hot really fast (I live in TX) when walking around outside. Great in the fall/winter though.
If your partner is much larger than you/smaller than you and also wants to carry, the moby is your best bang for your buck. It can fit a wide range of sizes.
Only you know what your sleep needs are and what is reasonable to expect. Some people need a full 8 hours or they can't function. Others can go with interrupted sleep/less sleep.
And then you have to factor in who's taking care of the baby. If you're sharing daytime care with someone else, you have to figure out if he/she is going to do their own thing (re sleeping patterns & rules) or adhere to what you want.