Newbies should not join yet only join once your a member .
there are 7 ranks - newbie , junior , member , full member , senior member , Hero and legendary. If i were you ill join at member or full member this is where your account is worth more and has more chance of getting in to a higher signature campaign.
Haha lol, you suggest him to join sign campaign when he reach higher rank at least Member, but in other side you are Junior Member and joining a signature campaign now.