For a detailed game info head over to:
http://galacticarmsrace.blogspot.com/p/overview.html
Better yet, try out the free demo. It is offline-only and not integrated into Steam, but will give you a good idea of the gameplay.
http://galacticarmsrace.blogspot.com/p/demo.html
Client help file:
http://galacticarmsrace.blogspot.com/p/client-help.html
Server help file:
http://galacticarmsrace.blogspot.com/p/server-help.html