Most heirlooms only work in a limited level range in their default form and must be upgraded to work at higher levels. That costs gold, and you’ll need around 30,000 gold to outfit yourself with a fully upgraded set (counting only those that give you bonus experience). You may need to spend some time on a boosted character to acquire the gold you need to outfit another character with heirlooms, but it’s well worth the effort.
If you’d rather read than watch, there are also plenty of resources you can use to acclimate yourself to World of Warcraft, figure out what to do next, and ask questions when you’re feeling stuck. For the basics, we recommend reviewing Wowhead’s “Guide on How to Play World of Warcraft,” which is definitely worth scanning if you’re new to massively multiplayer online games or just want to get a sense of how Blizzard’s approach differs from others you’ve played.
Players’ relationships with the NPCs around them have been hit-and-miss over the years. One of the original issues with Thrall, the Horde’s original Warchief, is that players began to refer to him as “green Jesus,” because of how infinitely powerful and infallible he was. But he’s been gone since the Warlord of Draenor expansion, and with the death of Varian Wrynn and Vol’Jin at the start of Legion, the old guard hasn’t been there to guide players the same way as it used to be.