Order refers to natural law as it pertains to Risla, Iislea, and Nelea and is generally creation oriented while Anarchy is the flow of magic through the natural world and is destruction oriented.
Law covers man's law and is embodied by Celeborn while Chaos is the "law" of demons as exemplified by Marghuul.
Good is righteous protection of the weak and improvement of the self while Evil is enslavement and neglect.
Law as it equates to Paladins can be seen in spells like Fist of the Justicar, which banishes demons (both bound and pets) on attacks. Spells that hinder or harm the breakers of "Law" would become more prevalent in the guild, and the meaning of "Law" as it pertains to Paladins will be more clearly defined in the guild's Future Plan.
I expect that to be the general progression of all the guilds - the outline will guide what they are capable of, and how they do what they are capable of will be dictated by the guild's relationship to other guilds. This overall dynamic is meant to be the first steps of clearly outlining inter-guild relationships, which will be followed with general guild dynamics, specific guild focuses/goals (this is what we currently have with 'help <guild-name>', and finally variations on the main theme.
