Tycoon is a shady company that is simply trying to get people to buy an addon that is a 'lite' version of a free addon that is actually better (TSM). The company behind it buys dislikes on YouTube videos from other 'gold-makers', refuses to offer support if, for example, your computer crashes and you lose your addon (you'll have to buy it again), and pays random people to praise Tycoon on YouTube with no personal use of it at all. Overall, just stay clear of Tycoon and any of its affiliates.
As late as possible. Early on, you’ll want to follow the missions in Battle for Azeroth right up until you get the option to send a follower on a two-hour long quest. As soon as you get there, stop doing the War Campaign missions. You can come back to them once you have reached something like 119 and a half and finish leveling with those if you want. If you don’t use these missions to cap off your leveling journey, then they’re the first thing you’ll want to do once you reach max level.
If you buy a ready character in World of Warcraft, you take all the risks, because the first owner can easily always get his account back, and you will be left without the character and without the money that you paid. That’s why we strongly recommend to order a character levelling instead of buying WoW character, so you will be the first and the only owner of your World of Warcraft character.
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.