alright so i just got a full wow account (finally

and im a lvl 24 priest and i want the tattered dreadmist mask which u get with a guild rep and im in a lvl 25 guild. so im neutral and i competed tons of dungeons and bgs and it didnt increase at all i was gonna get a guild tabard when i reached friendly but that's gonna take forever at this rate so how would i get more rep? and my guild xp badisappeareded 4 some reason? i also have 2 lvl 85 if that helps at all idk i just really wan my mask... but anyway it said i wasupposeded to raid and dungeon with my guild? what do i just go around asking " he u wanna dungeon with me hehe?" cuz thats really awkward and im not doing that. so how would i get guild rep faster?