None of them! There is no easy road to tradeskill wealth in this game. If you want to make good money, you will have to put in serious effort and even then there is no guarantee.
As a new player, your easiest and safest route to fast cash is to take on every quest you can find and then go out and kill the mobs involved. These will net you both silver and XP and probably some nice quest reward items as well. Not to mention the chest drops.
For example, at lvl 10 in Qeynos, you could go get several quests that ask you to kill klicnics, rats and snakes just outside the city's North gate. I think I had 3 quests going at one time for the klickniks (fire beetles) and 2 each for the rats and snakes. There are also a few good ones that are looking for badgers, bear cubs and wolves. These mobs will be white to you by level 11 or 12 and they all path nearby.
I also had 2 or 3 for the scarecrows in the field right there but I left them alone till I leveled up to 14 or so.
The beauty of "multi-questing" is that each time you kill a critter, you get the update in all 3 quests. Now, that really is easy money!