You'll want to download the GWT package and in there is a tool called
applicationCreator. This will create a template GWT project for you
which you can build on. I'm reasonably sure all the details should be
in the getting started section of the help docs.
I've never used the eclipse plug-in and all of my GWT projects work
great.
As for putting the GWT into several pages just look at how the
template project includes the nocache pages and copy that for all your
pages. If your pages are in different directories you may need to
adjust your path.
Hope this helps.