Tired of having no gold? Getting so frustrated that you might even go and buy it?
Professions are an easy way to make gold to get that lovely plate helmet or shiny epic mount. For the Warrior I personally use mining/blacksmithing, mining is very highly recommended for warriors and skinning makes a nice bit of gold as well. Alchemy/Herbalism is always useful for buffs and health potions and engineering is just awesome!
If your making an alt and have lots of gold already then enchanting and a gathering profession could be the way to go.
Any more ideas? Then just Add them!!!