It depends. It depends on your locality. In case of US market where a locality is no more than 50,000 people with some 12000-14000 people with the online presence, social media is the best and most economical way to promote. But as I mentioned before, it depends on a lot of factors. To start with - create a badge and collaborate with small brokers to promote your website. You will need a good incentive for brokers. It will be great if you can provide me your locality and link to the website for further evaluation.