That beginning stage is rough and we have never really had a solid routine.
We use a bassinet in our room next to our bed or in the walk-in closet. When we were younger we kept the kid in the crib as we had less room. At the earlier months, we were more willing to sacrifice our sleep for the kid.
After a month or so we get tired of doing this, and progressively, usually organically, start doing things that distance the kid from us and help us get more sleep. For example, we would let the kid cry longer in the bed.
Like put the kid down, set a time that I am comfortable with and then go do something, and then come back and check on the baby to see if it is still crying. If so, I would assess if there are any instant needs that I need to do, console the kid, and then put the kid back to sleep and repeat.
At night, we would sometimes use fans to mask crying, or have the baby sleep in a room that is not immediately adjacent to ours.
As long as all their health needs are met, babies learn to adapt to you rather quickly.
One of the problems with your first kids is that it is too easy to adapt to the baby, when you get a lot of children (we are expecting our 10th), you don't have the liberty to adjust to the baby as much. You can't really adjust all of your life to the baby when there are 11 other lives to consider.

But that being said, I think our kids started sleeping well as follows:
1) two months
2) two months
3) three months
4) two years
5) three months
6) two months
7) four months
8) five months
9) four months

Sleep is rough in that first bit, but you get through it.