New Animator

I have just downloaded the package an I just want to put some lines on the screen that I can curve and move around. I don't want a filled shape, just a dragable line. I can't find anything in the tutorials about lines. If I make a thin rectangle, then try to drag the centre, it just makes another filled shape. I have worked on it for 3 hours and still can't draw a simple s-shaped line. Any ideas?