If you are looking for penpals, one of which might later become your spouse, there is a number of ways to come across them. From the very beginning, you have two options: independent search and contacting a marriage agency.
For a woman, searching for a partner presupposes that she advertises herself or she looks for men who place their own penpals ads in the sources available to her. Every city has its own papers with dating classifieds, and some of them also publish ads by foreign men.
Another alternative that could turn out to be interesting is meeting a person through web chat. However, a computer with an Internet connection will not be the only thing you are going to need. Ability to type fast and good language skills would come in handy as well. If you want to learn more about chat etiquette, follow this link: http://www.geocities.com/SouthBeach/Breakers/5257/Chatet.htm.