If you have little to no experience with wiring, it is best to hire a professional. Call around for quotes and depending where you are, a licensed handyman may be the cheapest.
http://www.handymanusa.com/articles/ground1.htmlhtml
1: "Well, perhaps the best way, if access allows, new wire can be run that has a ground."
2: "Some homes without the ground wire, may be wired with BX or armored cable. This is the cable with the flexible metal casing around the wire. If this is the supply to your outlets, and it runs from your metal boxes all the way to your entrance box (where your fuses are), you are in luck. The outer casing of this wire can serve as the ground."
3: "Perhaps one of the cheapest and simplest ways to address this is by using a ground fault interrupter or GFI also known as a GFCI outlet. This is a good choice for many hard to re-wire cases.