you can also go to some of those small loans places such as cash america.. take out a small loan and set that money aside.. the next week go pay it back. But building good credit does take some time, there is no "fast" about it really, but I would suggest that to be one of the quickest ways. Hope that helps and Good luck. :)
To build your credit rating fast, you are required to have a credit card and keep a high debit to the limited ratio. You should also make your payments on time and avoid applying for many credit cards.