Help with plugins and missing nodes

[lukbor2]

Hi everyone, I am totally new to blender.
I am running Blender 2.64a on Ubuntu 12.04.

I've installed the software and it works, but I do not have any plugin and when I use the Nodes Editor I can not see many of the nodes showed in tutorials (for example all the nodes to manage green-screens).

Can someone tell me if i've to do something to have all the plugins and nodes available?

Thanks