Spending hours on leveling up the warlock can be tiring
, expensive and quite frankly, really lame. The real game lies in levels over thirty and getting there can be hard without a warlock leveling guide. The fastest way to the higher levels is to be armed with the research and knowledge from the experts.
Spending hours researching the quests you require is usually mind numbing. There are plenty of good web sites online, but hardly any of them do a great job of compiling the information in a way that is simple to make use. A lot of the good tactics are saved anyway because of plain greediness.
Wasting hours tracking down a spell you might not even need costs you membership time. Spending hours looking for a group when you could be soloing and making a ton of experience is also a time waster. Get on track with faster leveling.
Maybe your buddy refuses to switch servers and you still want to play with him. Well, since he is being ridiculously stubborn, you could decide to start up a gnome warlock on his server. The problem is, he is leveling from 50-60 on his human mage and he doesn't have time to level up your gnome warlock. You can easily catch up to your buddy and get to adventuring sooner with the help of a guide.
Warlocks are one the most versatile characters in Warcraft. If you want alliance or horde, then get a guide that fits your style. They are one of the best character classes for either soloing or grouping.
When you are really ready to get into the game with your warlock then get a warlock leveling guide. There is so much content available to higher level toons. Get to that content sooner with a guide. Without the help of a guide you will spend time on pointless quests and areas that don't get you any further in your goal of the higher levels.