As a lvl 25 sin, don't expect to find an easy way to make money. In fact, as a sin, don't expect to make money at all. ;)
Having 700k for a newb is pretty good (assuming you are new to the game). Just keep training, buying pots, and doing quests. The orbis scroll quest isn't really an option for you, as you're too weak, but around 35 you can try it - you get 5 scrolls and they go for around 20k-50k, so approx. 100k -250k easily (which althought seems like pennys to me, isn't that bad for you).