Select a text object (or create a new one)
Open the Stroke panel
Basic or Pencil strokes for simple outlines;
Airbursh or Random for unusual results.
Change the stroke from NONE to any of those available in the
Category option list.
Click the Fill tab
Set the fill category to NONE int he Category option list.
Now there is no solid, but just outline.
Various
strokes applied - no fill, outline only
Strokes can also be adjusted by changing the orientation of
the stroke on the Object panel.
Stroke outside path; inside path; centered on path
After experimenting with the Stroke, do the same with
fill.