Hi Vipan, you need to advertise through different media including online [property portals like 99acres.com] and offline magazines and newspaper [classified sections and specific real estate supplements].
The online media is faster and quicker. You may also buy a paid package offered by online portals. They charge on a monthly basis and in return, give your ad prominence over non-paid ads. For paid packages by 99acres.com, you may visit this link: http://www.99acres.com/do/buyourservices