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… you have a project/product you want or need to get done with a definite goal.
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Progress in a project needs to be achieved as best possible, and knowledge and risks about the work to be done need to be addressed as soon as possible.
You need to balance the level of responsibility of the team elements, micro-management (local plan vs global plan), terrain knowledge, prediction vs adaptation.
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Therefore, create a cross-functional, self-organizing team, that gets facilitated by someone experienced (the ScrumMaster), and that has enough competencies to accomplish the project.
Once you have such a team (Scrum Team), you are ready for a Sprint and your next step is a Sprint Planning Meeting.