i play this for about 3 days with my ps3. it's cool game, actually.
but as i played, i found that it's difficult to make money. this long, i've just have about 2000g from selling things, even selling weapons from place the Blades lives. i'm one of the blades.

is there any tips to get more money quickly?

thank you before

Later when you level up and meet harder enemies with more expensive armor/weapons, you will make a lot more money from selling their stuff.

As you progress, you'll also be able to do things for yourself, that you start off having to pay others to do. Like repairing items, or recharging magical weapons. So it gets easy to collect money, just as you need less of it.