First and foremost is that they participate in chat and know the guild plan. Also look for those who are keen to assist others in chat.
Next up is contribution to guild in weekly coins over time.
Arena power and player level is considered but not priority, good to have some lower level officers to represent that part of the guild.
Really depends on the guilds concept.
I promoted people who were on, in chat, and well-read on the raid. Go with what Pjay said, you're not gonna be sad if the person has good standing with you and contributes the 600GBC per day. If they do make you sad, just remove them. Easy as pie.
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Next up is contribution to guild in weekly coins over time.
Arena power and player level is considered but not priority, good to have some lower level officers to represent that part of the guild.
Really depends on the guilds concept.