Start simple. Here's a tutorial on one configuration:
I'd increase the file size 10x and add 64k accesses to the test.
The file server, web server, etc., pattern definitions can be found using Google. Once you know how to set up IoMeter as above, you can manually enter the definitions for those patterns.
You'll also have a better chance of understanding what they mean this way. (Which is nothing really special -- they're just specific synthetic benchmarks).