Don't put up leaflets, I'm sure I'll take care of you. You can hand out leaflets in crowded places (such as subway entrances), send more information online, or advertise in newspapers. In Beijing, for example, newspapers such as Beijing Evening News and Jinghua Times, do some small-character advertisements, and the price will not be very high, but the benefits are really good. There are too many people in Beijing who read the Evening News and Jinghua Times.