If you don't have a scanned newspaper image to use, follow Ute's
instructions - draw a Freeform or Scribble curve - then select "Fill
Effects" from the fill color drop-down. On the Texture tab, select one
of these textures: Newsprint, Recycled paper, Parchment, Stationary.

Then add a textbox over the torn paper shape to add your text.

Also, whether you use a scanned image or a texture fill, it might look
even nicer if you remove the outline as well by setting the line color
to "No Line".