The bosses above will shit on you, don’t let this impact on how you work with your team.
Consistently apply company policy, if you allow one person flexibility that goes against company policy, even if it is just on one occasion the rest of the team will expect the same.
Praise, some managers use the old “well they’re being paid to do it”
Criticism etc in person and in private.
Be open and available, unless you really have to say no, always say yes if a colleague needs to have a chat, for some people just asking to do that takes a lot of courage.
Your relationship with your work friends will have to change, don’t take it personally when they are no longer as open with you. There are things you would say to a close colleague that you would never say to a manager.
If your team members are on an hourly rate rather than a salary make sure all overtime is accounted for.
Be clear with your expectations. When I became manager my team were accustomed to having a coffee and a chat for the first half hour of work. People had also been taking the piss with lunch breaks. I worked out that one colleague was failing to work for almost six hours a week. I made it clear what my expectations were during our working hours.
Just as you expect your colleagues to seek help and support, you need to from your line manager.