The hardest part about any new team you join – whether new or existing – is figuring them out.
In the early days, it is where all of your time should be spent, because it is all that matters.
Learning who they are, what their role is, what they can contribute, what you need them to contribute, what their ups and downs are – essentially what value they bring to the team as a whole.
Once you have the team figured out, then you can start planning what the team is to do and where you need to take them from there.