Currently Being ModeratedOct 2, 2011 6:54 PM (in response to ItsyBitsyGirl)
There's a User Guide for Numbers that you can download from the Help Menu. Read about Charts.
Here are the basics:
Make sure that your X and Y data pairs are in Body cells (not Header Row or Header Column data).
Select the X-Y pairs that you want to chart and Insert > Chart > Scatter.
That should get you started.