There are more than one ways to make gil in ffxi. You can work hard for it; kill small beasts to start with until you start to level up. Later you can challenge the big guns, but for the moment it is wiser, not to mention safer, to tackle the mandragoras and bumble bees. Goblins can be pretty useful in this case as they drop some good priced things off pretty regularly. The idea is to check the opposition's level before engaging in a fight. This way you can sell the stuff you pick up and earn some ffxi gil making guide for equipping yourself for bigger fights up ahead, and importantly, for buying that 'world pass'.
For those inclined, there seems to be an abundance of websites allowing you to buy ffxi gil.