In your opinion what is the fastest money making gil if you have 0 skill points in all of them, I guess what I'm saying is what guild shows the most money early on?
fishing guild. moat carp trivial at skill level 10? and sell for 4k a stack at ah. later on in the 30's you can make thousands easy. plus, if you get up your woodworking, you can repair lu shangs for tons of money. and, of course, repair your own.
I believe if you have sarabuta cotton then go into the guild and get the bonus for 30gil. 4 grass cloth + 1 sarabuta cotten + 1 grass thread = Doublet Doublets go for about 5k.