Mining is one of the three gathering professions in the game. You mine from ore deposits for all the various ores in the game. Your customers will be blacksmiths, engineers and jewelcrafters. You can make good gold per hour from tons of different routes both farming for legion ores and farming old world ores. I personally don’t farm, so I can’t tell you the best routes, but check out Oldbess guide on mining for some great spots.
Battle Standard of Coordination: This item gives you 15% bonus XP if you stay within 100 yards, with a 10-minute cooldown. Can be useful if you are grinding in an area or when completing a dungeon. If you plant the banner at the last boss of a random dungeon you will get 15% extra from the bonus XP as well as that XP is awarded when killing the last boss. You need to be friendly with your guild to get this. The easiest way to get it on a new alt, is to buy a Renowned Guild Tabard with you main and send it to your new alt. Now you need to join a guild with the “A Daily Routine” achievement completed. So open the guild finder, if you’re not already part of a guild, and look for a guild with a lot of members since they are more likely to have the achievement, and ask to join. Then buy the Battle Standard of Coordination.
The Horde will now control most of Kalimdor, and the Alliance most of the Eastern Kingdoms. For a low-level character the quests and storylines won't change, but for high-level players many zones will see changes via phasing. Teldrassil is burned and Undercity is in ruins as the story progresses by phasing. At max level Arathi Highlands and Darkshore are phased to be updated to reflect their status as locations for Warfronts.
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.