I've been playing WoW for about four years now and 3 years and 9 months of that time was spent playing a single character (or account). As such, I rose to officer rank in my guild. Unfortunately, we were the top alliance guild for PvE on our server and had a huge rift mid-LK and reformed some time later as a PvP guild.

Enter me as officer.

Most guilds will be fine with multiboxing if you are CONTRIBUTING. For instance, I often lead BGs, as I've had a lot of experience with QQ premades etc.

If you are helping others in a guild and aren't being a smegpot and just running 10 mans where you take 5 spots up, most people are fine with it.

Atm, mine is a level 17 guild..but I don't really see why that's important. Although some of the guild perks are useful in all circumstances, most of them are PvE endgame related (flask master, mass res etc, no mount speed increase in BGs etc)

Just find yourself a nice level five guild Mount speed and 10% bonus xp is all you need