Word of mouth is the cheapest way to get leads. A simple way to encourage word of mouth referrals is to ask for them! Touch base with your clients and offer them an incentive to refer a friend, or ask if they know anyone else who you can help. You could also consider a partnership where you refer business to each other. Another idea is to start small with a Facebook advertising campaign. Through Facebook, you can spend as little as $5 per day and see what works best for your business in terms of reaching out to customers. Refine your marketing message to meet your audience and you will be more likely to have success.
