SPOILER:
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Errr...........in theory, you have obtained full membership once you rescued Garren's child and talked to the head of the Order.....the Order will give you quests everytime you speak to one of the fellas in the main hall. Since you said you have rescue the knights (assuming you mean Umer Hills' paladin stronghold quest) and Lord "some" (again, assumption that you mean the dispute settlement in Umer Hills), you are a full knight already. Unless you want a title change....like Sir "your character's name", which I don't think that will happen in game.....
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Long live H22A1!!!!!