Big Girls With Options

I believe in order to gain friends one must show themselves as friendly. A friend is there through thick and thin until the end. I personally believe there are certain requirements friendship require such as loyalty, respect and trust. A friend not only gives imput in conversations, they also are good listeners as well. I've found that I never meet a stranger, it's not hard at all for me to strike up a simple hello how are you. What requirements do you think a friendship requires? How do you go about gaining friendship? Do you make the introduction first or wait for the person to engage in conversation with you first?