iceman,
create the two columns you need.....the first one be the y axis and the second be the x axis. then use the chart wizard and follow the prompts (the first one should be which chart you use - ie bar, line, etc). start with a basic one with made up numbers and see what you get. after playing for 10min you'll get the feel of it.
if you want it automated the easiest way would be to have the chart on a hidden sheet and the macro just hides/unhides the chart. if you want more complicated, just record a macro from when you start building the chart and then go into the macro and look at what it does.
im sure there is a visual basic for dummies book out there.
hope this helps.