Another part I like about Dugi’s leveling guide is the ease of use. You’ll be given the guide in different forms so that you can find the one that fits you. For those that like to have a printed guide alongside them he provides you with a printable and image heavy version of the guide. A very powerful system Dugi uses is his in-game leveling addon that permits you to play without having to take your focus with the game itself. The addon adds a tiny window for your World of Warcraft game that tells you what area of the guide you’re at and how to proceed next.
Like with addons in the current game, you just need to drop any of these addons into the addons folder — find it under /Interface/AddOns/ in the Classic beta folder, which is in your World of Warcraft folder by default. Then once you log on to the game, you’ll want to make sure that the addons are enabled via the menu option on the character screen.
If you're looking for simple, just get actionator. Set it to undercut everything you post for 1c and alt click from your bags. It will place the item on the ah window, do a scan for that item and autoset the price for how much you told to undercut (you can change it accordingly if you feel like it). It will remember if you do stacks for which items and replicate it everytime.