Hey guys, first guide so sorry if it's messed, but here goes it.
When starting a new server, you are away from your mains and easy gold, so this is a simple little trick to get some easy gold on a new server!
The first thing to do is level up a few times, do quests and grind to about 50 silver, for money to post auctions.
Now that you have what is needed to start, time to get into the business! The first thing you should do is bring your new char to stormwind/orgrimmar. Watch trade closely, for guild adds bragging about many guild tabs and also claim to be social or casual, guilds that do this generally have 1 or 2 tabs with 5-10 daily withdrawals. At the same time, look through the guild finder for similar ads. When you find one immediately whisper a member for an invite.
NOTE: If the guild doesn't give free withdrawals, find a new one!
Now that you have free materials, time to make some money. Look at items that may sell fast and search AH for them, withdraw all the expensive things, and undercut the current auctions there. Since the items are free, you lose no profit!
With this method I have made 750g on a brand new server in about 2 hrs playtime, not too bad for a level 6!
Items I find sell good are eternals and green gems.
Good luck!