Okay, so one of the most important things to get started to work together with your team and colleagues is to have them on the same team as you.
Before someone can join your project, the need to be part of your team.
So your team, is basicly your company.
Invite the people which you would like to be part of your entire team, and those which are part of your team then create their own projects and invite other team members or be part of your project.
This is super important to know.
Take the opportunity to find out how to invite someone then to your project.