Friends, Facebook, Youtube, Blog, forums aimed to earn via internet, printings tons of pages filled with your referral link and pasting them around your city, e-mails, advertising, opening a website or just use some social tricks (if you can type well) to convince people to contact you privately (in places where it's not allowed to post your referral link or in places where it's not related at all and thus it's a better idea to gather only interested people who happened to pass by) and explain them about gp, maybe a small guide to start with and obviously your referral link.