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Well, the first part is easy with the 'File > Primitive factory' that allows you to create a sphere at a specific position (and radius).

For the camera, you can also use the 'Display > Camera settings' dialog to position and orient the camera. You can also switch the view to 'Perspective mode' so as to be able to set both a camera position, and a camera target.

However, there's no direct way to constrain the camera center on the sphere. You can pick some points on the sphere, and then manually copy these points coordinates in the camera dialog.