This is what classic is... mana is crucial. It's not a near-infinite DPS bar like retail. This is the kind of thing that traditional players prefer. And for the most part it is the expectation of each mob in a way to be similar to the player's level of WOW TBC Gold power at least 70 percent. In reality, (played through all the classic) TBC seems WAY easier and less harsh with mob damage and mana regen. It's even easier to level me.
It's a dumb question, but, have you received an animal hunter trainer quest? Hunter is the most simple class to reach. It's also the easiest if you are just starting out in the game. And if you have pet, maybe your pet isn't able to take the heat? Make sure that even if your pet is struggling in a hurry, you shouldn't just go all out and just press all the buttons to get rid of the mob. That way you'll get your pet overagrowed for cheap Burning Crusade Classic Gold sure. You must feel the flow of killing mobs. It may seem slow, however, that's because of the way WoW is built, you can't do anything in WoW fast unless you employ certain techniques like dungeon boosters, which I would not recommend to players who are completely new to the game.