Erm…crud, I don’t have long…
I’ll have to be quick. If you’re looking for a GOOD python tutorial, I suggest that you search on Yahoo or Google for ‘Das BlenderBuch’. It’s a German site, but it has translations of its tutorials, and they’re very informative and good for the newbie.
As for using plugins…This varies from plugin to plugin. Normally, most are simply a script. To open them, open a text editor window in Blender (you see that button in the bottom left of the 3d windows? Click, hold and drag and select the text editor icon). Select to open a text file, and open the script (the .py file), and it’ll appear in the script window. Press alt-p to run it.
Other scripts are already in a Blend file, all prepped for use. Just open them up, go to the text window and press alt-p, and let the magic fly!!
Hope this helped. Sorry about the rush - I’m in school.