I can only answer for The Mercenary Guild.
\"If I were to join a guild what would be expected of me now?\" - Activity on the forums (in game is less important for now), interest in the guild, the creation of a character profile, and general enthusiasm.
\"What work would I need to put into it?\" - as much as you like, but to be promoted you must show loyalty and contribute to the guild (for instance Klyaksa is creating a flash animation for the guild, he was not required to do this, but never the less he is contributing which makes promotion and trust more likely).
\"But what are the advantages to been in a guild now?\" - A sense of community (See our
forums for example), a sense of purpose, and an increased chance of being promoted (the sooner you join, the sooner you are promoted).
\"And can some one be in more than one guild?\" - It depends, most guilds won?t allow this. However, while it is not encouraged, we (The Mercenary Guild) do just about tolerate this, but we like to think we can win you over to just being a mercenary? And if you do have multiple guilds then you will need to prove yourself twice as much as others, to get promoted half as much.
\"This also may sound silly but is it your Character that joins or is it the player?\" - Both, but mostly the character. However it is better if the player is involved with the guild community.