You have entered all project parameters, so the project becomes active with the start.
After all, not all projects are a one-man show. If you define a task directly, this is the fastest way to enable an employee to record the service.
If you create a first task at the start of the project, it will be delegated directly and this task can be booked as a work package.
If you do not create a first task at the start of the project, the project ends up with the project manager. Its task is to plan the first and all other work packages in the work breakdown structure.