Hi
Jasper report itself come with some nice samples and tutorials which are available in
http://jasperreports.sourceforge.net/tutorial/index.html and samples which are located in "Jasper report folder"\demo\samples
but if you need just preparing your report take a look at Ireport
http://ireport.sourceforge.net which is a WYSIWYG like report designer ,
there are also some other report designer for jasper report , you can find them from the jasperReport web site.
I suggest that you check out BIRT a project from Eclipse foundation , it will highly ease designing reports and charts
http://www.eclipse.org/birt/ HTH