I've used WoW-Pro for years and in WoD, Legion and now BfA it's been awesome for just going on auto-pilot and working your way through a zone. It has 3 levels of depth you can set, so you can set it to just do 1) the main story, main points of interest and rare mobs and treasure that aren't far off the beaten path; 2) every quest with a more thorough dive into the side stuff; 3) absolutely everything.
Dugi Guide, I have found, is a great solution for all those looking for an elaborate WoW Guide. Besides having the always popular leveling guides for both Horde AND Alliance additionally you get a gold earning guide, which is also the most popular Warcraft product. On top of this he covers a multitude of topics from macro’s, talent builds, profession guides and even more.
after leveling up im considering leaving the game, plenty of quests with bugs missing npcs and really no one in the worls, feels like a single player game. also current content is the worst possible, leveling in legion remind me of how good it was, all the spots had something i could do, i look i farmed dh hidden appearance here, bfa its like wod with 0 content and nothing better then grind.
Pick a simple goal or idea for your AddOn. It's often a good idea to just make an AddOn that only opens a window or prints a message to get started, especially when everything is new for you. After that works the way it should, and you have learned everything necessary to make an AddOn work at all, you can move on to adding one piece at a time toward your goals. Writting software in general is often a never ending process because you can always think of something new to add or improve.
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.