hahhaaha
It is simply very individual. How the children are, how the parents are. Some do co-sleeping until whenever, others move out quickly (in our case after 6 months). Experiences of others or even guides are only usable to a limited extent.
Therefore, still the vote is not to invest too much in advance. That is usually pointless. The important things push themselves forward on their own. The good news: Nothing of it is vital for survival, everything needed can be obtained in a timely manner. No one dies because the heat lamp doesn't work, the diaper is changed on the floor, or the bottom is red.