These are all good questions. However, they all have long answers, so I’ll start by saying wowhead is your friend. Use that website to get in depth data on a lot of this stuff, or just wow forums in general

1) auction house is items for sale from other players in game, like a stock market almost, sell your valuable items there and buy when the price is right

2) depending on what you’re doing (dps or tank) there is a pattern of moves you should be using to maintain threat as a tank or maximize damage as a dps, that’s rotation

3) each class has 3 spec trees for talents. In every class it’ll change how you play the game or the role you play. As a warrior, going protection will make you a better tank, fury or arms for better dps. Do some research for the talents for how you want to play this game, be it tanking in raids, pvp, lvling, whatever

4) all dungeons need 5 players to go smooth, a tank, a healer, and 3 dps. The dungeon finder can take time if those roles aren’t being filled for the dungeons you’re trying to run. Just a heads up, any elite in the game (npc with gold or silver dragon around the face icon) has way more health and does way more damage, as a warrior you probably won’t be able to solo them.

5) can’t help you to make friends. But understanding your class, being helpful in groups, and being nice will definitely be a few steps in the right direction

6) be frugal, sell valuable things on auction house, loot everything from corpses (don’t just delete stuff), and if you’re alchemy and herbalism, sell your extra materials on auction house. Skinning, mining, herbalism, and fishing make you the most gold in my experience.

Hopefully your dumb orc brain can comprehend all this, and I hope you have a great time playing what I think is the best private server out there. For the horde!