The place to start for information is the project home page, which is here.
Among other things, this will give you an overview of the available tags, including this documentation.
From the project site you can download the tag library and a sample application. However, if you want to deploy the sample application as an Eclipse project, you'll still have a bit of configuration to do.
Instead, I recommend that you download and unzip this Tomcat project. It contains the tag library and the sample application, and is already configured as an Eclipse/Tomcat project.
You'll need to
File > Import > General > Existing Projects into Workspace
to incorporate the project MAR11 into your Eclipse workspace.
Window > Project > Properties > Java Build Path > Libraries
You'll see five references to Tomcat files. If your Tomcat isn't in the same place as mine in your filesystem, you'll need to replace these references with references to the corresponding jar files in your installation.
At this point, you should be able to use the example application at MAR11/index.jsp. Use this as the starting point for your own application.