As mentioned above, the Necromancer's ability for summoning allies essential for WoTLK Gold keeping some of the pressure off you. It's a good thing that everyone has the ability to solicit help without the need to join multiplayer. Once you've progressed through the first part of the Act 1 story, you'll get the chance to hire your first mercenary through Kashya (one of the NPCs of Act 1's Act 1 town, the Rogue Encampment). There are many types of mercenaries to hire as you progress through the game starting with the bow-wielding rogues in Act 1.
There's only one mercenary at a time, and you'll want to ensure you select one that complements your class. Consider their skills in the event you decide to employ one; a rogue with Cold Arrow (which slows enemies but deals less damage) might be less useful for you if you're a Sorceress that is already slowing enemies, or a Necromancer who has summons that can divert enemies from their attention.
If you've got a mercenary, make sure to outfit them with equipment to increase their effectiveness. Additionally, it is important to know the fact that ethereal materials cannot be repaired which is a benefit for mercenaries due to the fact that those equipped with mercs won't lose their durability.
Even in the early going it is possible to acquire gems that are able to be incorporated into items with sockets. These can be extremely beneficial and socketed cheap WoTLK Classic Gold weaponry particularly can provide you with a major improvement in your damage. Even if the basic characteristics of an item aren't the best keep in mind that having a large number of sockets can be transformative If you utilize them in the correct way.