Step 1 : BE AWARE OF YOUR STRENGTH
To be able to farm in anyway either single target or AoE farming you need to see how strong you are and how well you can handle your character and all other things.
To make things easy for you I will make a list of the classes based on there farming potential overall ( single target and Atlantica online Gold farming )
Step 2: FIND YOUR VICTIMS
Now that you know what are you capable of its time to et to the part were you slaughter innocent monsters a.k.a MOBS. But how many Atlantica Gold can you make by this way? Killing aimlessly will only make you lose money from potions/repair/food etc. so here is my advice to you : Scout AH see what sells nice and is also easily farmable and go for it
The best choice of for your average farmer are the Daily Items. Also try to aim for places that have a multitude of drops as cheap Atlantica online Gold /tems/dailies to be able to get maximum cash for a small effort
You open the loot menu and do not loot just stand there with it open and shout either in world chat or in zone that you want to sell the item if your lucky you get a buyer. Invite him in party tell him to come to you and when he is next to you loot the item and do not pass until he pays of after he pays you will press the pass button and you just made a nice amount of cash from a tiny little mob