Carried this over from my original post so that it would be visible to new people without having to comb through 4 pages of the other thread.

Here is an easy way to make money that literally anyone can do. Kill crabs for their meat to NPC, (as was previously mentioned it vendors for around 270g and crabs are present in all 3 starting areas,) then kill some Goblin Fishers until they drop a Clothespole, (also available in all 3 starter areas.) You can also farm more meat to just buy the Clothespole (2k) if the goblins are being stingy. Then buy a stack or two of Little Worms from an NPC, (they are like 3g apiece, available in all 3 cities.) Fish up some Crayfish, (again available in all 3 starting areas,) until you hit 6 or 7 skill. Vendor all your Crayfish or wait for AH sales if you wish. Use the Crab Meat gil to buy some Insect Ball bait off the AH, (usually around 3k/stack.) Fish up Moat Carp to your heart's content, which can be done inside of all 3 starting cities. Congrats, you now have as much gil as you're willing to put the time in to fish up.

Stacks of Moat Carp sold in last 15 days as I write this: 3265 @ 3k a pop = 9,795,000g in Moat Carp sales in the past two weeks. You're welcome.

Also for the love of god, don't undercut ridiculously if you want this method to be sustainable for awhile. Your fish will sell you just need to have more patience than a five year old.