Newb Corner
As a new guild member, here are a few not obvious things to keep in mind.
Representing
Representing the guild allows you to see guild chat and display the [AB] tag. So if you're part of the guild and only hear crickets in the guild chat, check your represent setting in the Guild Menu.
Please note that representing occurs per character. So you can conceivably have one character representing AB while another represents another guild. Also you can turn off your character's representation by clicking the "Stand Down" button.
Partying with other AB players
You earn more influence while in a party with other guild members. If you're doing any events and see other AB players nearby, don't hesitate to join their groups.
Guild Bank
As soon as your rank changes to Member (which can take 2-3 weeks), don't forget to check the guild bank, which contains many useful items.