I've done a school project on internet and mobile scams, so I've got some idea on how they work.
Basically, a ‘Nigerian’ scam are called Nigerian scams because the initially came from Nigeria, but they can are now basically spread across the planet (haha, who's ever heard of a copyrighted scam?), so they can now come from anywhere in the world. So damoon... they're not all made by Nigerians...

So don't worry.
These people usually say that they've got some money or some thing (a huge sum, of course, like millions) that they want to share with you... or that they need your help in retrieving this "money" that has been trapped in wars or something. But anyway, they just can't get it out or something. Like government taxes or something, and they need your help in getting it out.
Then they like, ask you to pay some kind of up-front money or some sort or give them your bank account or credit card details (you never know, some people are actually desperate enough to fall for this.

) to help them get the money, and that you are promised to get a portion or a kind of percentage of it. You might be asked to pay some money for "taxes" or somethings to help get the money to your bank.
And oh yeah, they're usually (the scammers and scams) from overseas so you can't track them...
But anyway, these money that they ask from you may start out very small amounts. But if you actually pay them, they make up new fees that you have to pay out of your pocket before you can receive your so called "millions of money" that they have gotten. And then they will keep making up these fees until they think they should stop.
So yeah... and you will never be see the money that you have sent over, nor the money that was promised to you...
And no, they don't exactly get the money out of your bank account. If they do, they'd be easily traced, I reckon. But smart, isn't it? Well, it would be when it initially started. No one would be expecting it and they'd think that they actually would strike rich.
But if it was my case, like, if I was the first potential victim that they would try and scam off, I'd be like: "er... wrong email?"
"Maybe you should check the email first."
haha.