First (and the most obvious step) create a NUB character. Then pay to become a supporter. Don't worry about the initial $10 cost, you'll make that back with interested in four months, when your NUB ends.
For your character, make a single FB mage. Train only HP and FB. You'll want to train more into FB than HP, have just enough HP to keep you alive.
You'll want a tattoo, any tattoo as long as it's a full one, it really doesn't matter which type. Some will be more useful than others, but you're not wearing it to make it part of your strategy, just to level it. To get your hands on one, I suggest selling your supporter item (unless that is a tattoo).
Then fight. As much as you can.
Don't spend any game cash. On anything. Hoard it.
In four months time, the moment your bonus ends, sell all the cash you've made, your character and huge tattoo for USD. A month into my bonus time I'm making around 100K a day. I don't think it would be hard to earn 200K per day with the bonus (this amount will only rise as time goes one and bonus percents get larger). Only taking 3 months (at 30 days a month) 200K per day will net you 18 Million by the end of your bonus time. Let's call it an even 20 Million.
That's (at the low rate of 10USD per million) 200 USD before that sale of your large tattoo and character.
Just plan to start 4 months before you need any cash (Xmas, birthdays or holiday spending money for example) and that's a nice little nest egg. Not world dominating, but nothing to sneeze at.
Tempted to do this again? That's against the rules, as you really need the NUB to make a lot of money, but you could ask your sibling, partner or housemate to create an account and follow in your footsteps. If they aren't to eager, promise to split the proceeds with them. You could always carry on with a new NCB character, but you'll only be making around half the cash this time.
