first, as you guessed, the form letter machine comes with no templates other than the sample one.
it's currently made really for people who have their own special types of letters/emails that they write, rather than using present ones.
i think it would be a great idea to share useful templates. we can do so simply by sharing the form letter data files and posting them on the forum here.
as for creating new templates, it's easy. The Form Letter Machine calls a "template" a "Configuration Tree", so just go to File -> New Blank Configuration tree from the main menu, and create a new template and save it. no programming required.