These are Warlock- and Mage-only skills which can net you some money. It's not much, but a few gold is worth it. Note that Mages have an easier time with this than Warlocks as Warlocks need to be at the location for the summoning and need an additional person (a 3rd) for the group to help out with the summons. Mages only need the reagent to open the portal. While the Warlock doesn't incur a cost (except the loss of a soul shard), the Mage will typically be more successful at finding employment using this method.

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Professions are skills used to create and enhance items (gears). You will start with one skill once your character has learned a profession. When you use the profession, your skill will increase. A profession’s higher skill will allow you to create more powerful items. If you change a primary profession, you will lose any skill you have made with your original profession. So it is important to choose your primary professions wisely.
This is a VERY GOOD potion of treasure finding farm that generally shocked me when I stumbled upon it.  In this video it's one of the more popular farms – just because it's potential to tap into soo many different markets (especially if you are a skinner).  It takes place at the pit of scales near the foot of the uldum river.  It allows you to not only gather tiny treasure chests faster than any other spot, but also awards an obscene amount of leather.  Just step on the eggs and 5 crocolisk will attach to your character.  Kill them all and start skinning them.  There are 6 egg spawns with very short respawn timers surrounding the area.  You will literally never be waiting for respawns.  Again, skinning is a must to take advantage of this mega spot – and even though, I feel only a handful of farms surpass this one, It's truely my favorite.
Weak Auras is the most important AddOn for players seeking to master their class and take their gameplay to new heights. If you aspire to do any Mythic raiding, this is the most powerful tool in your kit. Weak Auras allows you to display helpful visuals cues anywhere on your screen, which enable you to play better. Most players use it to track their trinket procs, highlight on screen displays of their most important cooldowns, or track the timers of boss mechanics. It is highly customisable and makes keeping track of your procs and cooldowns effortless. The drawback of Weak Auras is that is has a bit of a learning curve and is not the most user friendly. Weak Auras allows you to import other players data directly into their UI, however, and most players choose to simply import other people's Weak Auras rather than make their own. Weak Auras can be used to create just about anything you can imagine, as it is a LUA scripting tool (essentially an AddOn that creates other AddOns, in-game). This is by far the most essential AddOn for players looking to step into Mythic raiding.
If i start on a new realms, I am farming a lot of transmog from classic and Burning Crusade Dungeons and Raids. In the beginning, i start to post them if they have at least a DBRegionMarketAvg (Average value of an item on all EU realms of the last 14 days) of 500 Gold. All the other items get vendored. The time you hit a stock of 1000 Items, my value treshold raises to around 2.500 Gold. All the items below that value get vendored aswell. Newly farmed items that are above these treshold will be listed. Why? If I start over somewhere, I want to get a certain amount of gold quickly. Cheap items are great for that. Later on, to save time, Quality is better than quantity. As mentioned above, re-posting the items on the auction house takes quite a bit of time. At this point, I can recommend you the TradeSkillMaster AddOn, it makes your auction house work really a hell of a lot easier.