This manual is written for Adobe Illustrator CS2, mostly no problem to use the older version. The result will look something like this:
Select from the tool palette the pie chart tools. If you press the icon twice to open the settings chart data.
These settings are available after creating the chart, so individual data can be subsequently changed. Draw a graph, insert data into a table, the names of the values in the first row, the values in the other. Create color gradients which color code each field plot.