I would like to argue for the psychological safety that Google found in project Archimedes. As a manager (of any group) one of the most important things to bring is to genuinely care for your people. Also spend time on making a culture where colleagues care for each other.

At the same time, it is important to be willing to take the difficult talks and decisions early on. If you have a bully or somebody tearing down your team, take action. This also goes for interactions with the rest of the company. The task of the group is to build the best product/service/whatever for the company, and anyone aiding in that should be welcomed. Anyone hindering it needs to be stopped, regardless if they are part of the team or belong somewhere else in the company.

Finally, make sure decisions, targets etc. are there because they are good, not because of politics or ego. It may take a bit more time early on, but getting everybody on the same page with respect to how and why you (as a team) want to do particular things always pays off.