If you’re looking for a warcraft leveling guide to take you from level 1 to level 70 in as little time as possible then you’ll probably want to look at something like Zygor’s warcraft leveling guide. Follow that guide and stick to leveling (as oppesed to spending hours in the battlegrounds) and you should be able to get to 70 in as little as a week (using the /played command in game.)

Otherwise here’s a way too short Warcraft leveling guide:

Enter an area, grab all available quests, and read them. If there is more than one quest to be done in the same area then do those at the same time. Try to set up your quests (and mob mashing) in such a way that when you’re finishing up you’re close to where you started.

Don’t go out of you way to do anything. Stick to what needs to be done to finish the quest, and kill a few extra mobs on the way to and the way from. You’ll get more drops that way.

Get the biggest bags you can and make use of an alternate character that will stay at the auction house. Your main character will mail goods to the AH character and that character will buy the bags and stuff for your main.

Minimize trips to town, minimize exploring, just try to go from point A to point B as quickly as possible. See how many quests you can knock off in how little time.

Good luck!