Just mail the stuff you can sell to an alt that is IN a major city.You might not think this now if you are new to the game, but leveling earlier power leveling really does not require any special power leveling guide. Once you ding 10, you should move on the next area. For example, from Mulgore to the crossroads (Tauren). From durotar to Barrens, from Elywnn forest to Westfall, etc. Earlier levels have enough easy, yellow quests to do to keep you occupied. If not, just grind. Earlier levels is really the only time I grind full levels. power leveling later levels gets trickier. Grinding is usually boring and slow.

Don't waste your talent points. I'm not telling you how to make your character, but if you spec your druid in restoration for example, you are not going to level very quickly. Also, don't spend talent points randomly in all 3 lines.Don't waste your time going to Auction House every time your bag is full or something. From level 1-10 or so, your starting area should provide lots of easy quests that will take no time at all to do. If you still do not ding 10, just grind on some mobs until you do power leveling.

When you find an instance that gives substantial EXP in a short time, go ahead and repeat it until you ding. Even if you have all the good gear, you can still get exp and money from vendor trash. Use the "Looking for More" tool built-in, or ask some of your friends you met earlier from other instances. Therefore, you should focus on 80-90% questing and 10-20% grinding. Alliance typically has more quests than Horde, but this shouldn't slow you down much if you play horde.