Get the best vendor gear you can for cheap. Shouldn't be more than 200k tops for a full set.

Gather loads of basic materials. Ores, Sands, basic Logs, that kind of thing.

Yes, the big bucks are in the top-end materials but mid to low end mats still sell very well. Hell, even stuff like level 20 materials still sell by the thousand each day.

Sell things in stacks of 20. People will be more inclined to buy a stack of 20 at 1000gil per item, than a stack of 99 at 700gil per item.

You'll soon make enough for the crafted set, but in the process you will also learn how gathering works as well as doing your job quests.

People are too impatient these days, always wanting to get the big score without putting time and effort in. Let this be a lesson.