I started in Ul'dah, i am a warrior, i started doing that quest where you sell that flower for 2kgil then i went to the camp, with 4 leves did 2 at one star, the other 2 at 2 stars i was lvl 4-5, then i killed monsters till i was level 7, went back grabbed the other 4 leves did them at 3 stars, got level 8, i had 4Kgil (i get 180gil per leve )
My main wepon upgrade a level 8 sword cost 12k on the merchant in the wards, on the wards themselvs is not being sold, with the 4kgil i had i bought a shield level 5 for 3.5k from the merchant(So i could use aegis boom etc) i went ahead and did the other part of the sand whatever quest, the one where you go to the camp with the cat girl and you get 5K, and thats what i got
Ok. You're not NPCing your loot, are you?
Some stuff is ok to NPC (that's how I got by) but others you can make a good deal more in the markets. As you're stationed in Ul'dah it should be easy to just check in occasionally and keep your Retainer up to stock.
Also, some clarifications here.
'Warriors' Don't use swords, Gladiators do.
'Warrior' is also a job, you're probably referring to Marauder, as Gladiator's first NPC sword upgrade is level 13.
The 4 k item is a fair price range. Leves starter level do 140-240 per leve not including difficulty bonus, and straight gil from chest. The remainder of your income comes form mob loot and crystals which you can market or NPC for sufficient income.
Don't worry about being overleveled in your gear for grinding. Buy upgrades when you can and be sure you're selling the stuff you're getting that you're not using immediately. (Don't worry, you'll get plenty of crystals and shards, right now, you need raw currency.) When you get bored of leves, look for local quests or storyline quests to complete.
But make no mistake, that little two-level trip killing monsters instead of doing leves, hurt your income, especially if you're not selling loot.
Something to help you a bit...
Item information, monster location map. Whole bunch of goodies on that site. I mention it because of its map feature for you. If you like hunting down monsters, you can track locations of monsters with loot that is profitable (You'll have to look in your Market Wards). Then track down and kill some. Warning though, usually the most lucrative monsters tend to have competition. Though, as a Marauder you should be able to hold your own.