I am new as a project manager. I was told that I have to write a project charter for a new project that I will have to manage. Are there any templates explaining what has to be in that charter?
I understand it as some kind of contract, but a contract between who? How can I precisely define the scope of the projects? The deadlines?
Wikipedia does a good job of explaining the purpose of a project charter. It even includes a link to a sample template, although any given template may or may not suit a particular project's needs.
A template is not a substitute for understanding how to charter a project. However, searching the web for some variation of:
will turn up lots of resources on the subject, including a wide variety of templates.
