live Arch Linux builder
Using the GUI
larch-7 is (in contrast to previous versions) designed to be run from a graphical user interface. It is possible to use it from the command line, but this should really only be done when scripting builds - the command line provides just a subset of the operations available in the GUI, in a much less comfortable form.
The larch documentation is available in the GUI, and there are documentation pages for each of the tabs in the larch window.