Hi:
Here's an example of using GPLOT.
http://support.sas.com/kb/25/584.html
It is from one of the SAS/GRAPH sample sites (the type you would find if you searched as suggested by Scott in his post). The GPLOT documentation also has a sample section specific to GPLOT:
http://support.sas.com/documentation/cdl/en/graphref/63022/HTML/default/viewer.htm#gplotchap.htm (has 10 examples at the end of the doc section)
And this public site, by Dr. Allison, has many, many GPLOT (and other examples) which may be useful to you:
http://robslink.com/SAS/Home.htm
If you use GPLOT, you generally want to create a plot from data that will have X and Y values. For example, if you were generating a time-based plot, you might have MONTH on the X axis and WEIGHT on the Y axis; or DAY on the X axis and PRICE on the Y axis. You might add a classifier variable to this type of plot, so, for example, you would have DAY on the X axis and PRICE on the Y axis and different symbols would be used for COMPANY (assuming that you wanted to compare PRICES for each COMPANY for each DAY). Generally with plots of this sort, you might join the plot points so you could see behavior across time (up trend or down trend).
Or, if you were doing a scatter plot, you might have WEIGHT on the X axis and CHOLESTEROL on the Y axis in order to see whether there were any clusters of values for CHOLESTEROL for WEIGHT. You might add a classifier variable to this type of plot, so for example, you would have females indicated with one color or type of marker and males indicated with a different color of type of marker. Generally, with plots of this sort, you might want to see clusters of values or add regression lines or confidence interval lines to the scatter plot.
These are just a few of the plots that you can generate with PROC GPLOT (and if you're using SAS 9.2, you may want to investigate the SG procedures, such as SGPLOT). But without knowing more about your data and the structure of your data, and understanding what you would want to see plotted on the X axis and the Y axis, it is hard to come up with more concrete suggestions.
cynthia