Also get the Heirloom Mount. Being able to have basic riding speed from the beginning will save you a lot of time if you're starting from level 1. Allied races start at 20, so this is a non-issue for them. It's important to note that Pandaren can not use this mount until they finish their starting zone and pick a faction. Being Horde or Alliance is a requirement of the mount.
SSC has been known for it's abundance of pet drops, which is why this farming spot exists. It can only be done once a week by each of your characters, so make sure to hit it if you can. Generally you'll want to kill all the bosses for a chance at their rare pets. Everytime I go, I have the luck of getting one, in the video I actially got the Tideskipper to drop, and a video I done on the spot before that, I got the tainted waveling. So yeah. It's a pretty awesome spot with high rewards and also some world drops. I was able to snag a will of edward the odd as well, totalling a nasty 35,000g. The most important part is that you kill the bosses, the pet drops do sell, and they are very easy to get. Well worth the time invested.
2. Begging - Many guides will tell you begging is worthless and will not work because people get agitated. This is not entirely true if executed properly. As more players accumulate gold through Wrath and Cataclysm items and professions, the number of casual players with gold obviously increases. These casual players remember how it was to just start off and be poor. They will often donate a few gold to a sob story or a "noobie". Look for the players that are not in full epic sets of the best gear, but rather, the ones in heroic gear or worse.
So about half an hour ago we got a post on the PTR Wowhead site talking about new Tools of the Trade questlines being added in 8.1.5. It adds several different questlines that lead to different crafting items for those with max level professions. Some of the more interesting ones, such as Iwen's Enchanting Rod (https://ptr.wowhead.com/item=164766/iwens-enchanting-rod) look to be REALLY nice to have. This one allows you to gain extra resources for 30 minutes when you're disenchanting items.
Many players who already have higher level characters create alts that they level to a certain point and then stop. Often, these twinks are level 18-19, 28-29, 38-39, etc. for the purpose of going to battlegrounds at the top of their tiers and kicking butt. Since these twinked characters are owned by higher level players with lots of cash, they usually outfit them with the best gear available at their level. Thus, items that require level 17-19, level 27-29, or any other items around this level, with good stats or dps, often sell for much higher prices than they normally would. This is especially true on an older server, and also especially true of blue (rare) items. In general, "good stats" include Cloth "of the Eagle" (for mages, warlocks), Leather "of the Monkey" (for hunters and rogues), and Mail "of the Bear" (for warriors/paladins)as well as weapons with these suffixes that can be used by the right class.
I like his recommendations 2 level 1-20 zones to get to 20, then do all the 2nd zones since they are designed for walking (Horde: Northern Barrens, Silverpine Forest, Ghostlands, Azshara, & Hillsbrad Foothills if you need a little more. Alliance: Westfall, Loch Modan, Darkshore, Bloodmyst Isle, and if you need a little more Redridge Mtns, or Duskwood). Don't even bother with the higher level areas, too spread out. Finishing up a Monk now and I had done all these zones before the update, the running between quest and the 50% experience cap is driving me crazy.
The most simple thing is TradeSkillMaster. This AddOn shows you quite an amount of information in the items tooltip. In my opinion, DBRegionMarketAvg the best source. It tells me the price, an item was posted on all EU realms in the last 14 days. Why not DBMarket? DBMarket only shows you the items value from your server in the last 14 days. This value often gets manipulated. Some people start to post an item with a 500g value for 500.000 Gold on the auction house for several weaks. As a consequence, DBMarket is rising towards 500.000 Gold. If you use DBMarket with 100% and post your item for 500.000 Gold, nobody will buy it.