Get the Word of Mouth Going!
Make sure you always carry business cards - with your name, company, phone, web site, and a quick statement describing what you can offer to people - make it describe a benefit people will relate to. You can put your photo on it, if you think it will help jog people's memories of when they met up with you.
Try to get testimonials from people - if you repeat them to others, they will tend to trust you and what you are offering. Make sure the testimonials are placed on your web site, or perhaps quote a good, short one onto your business card.
If you have a way to get people to "like" or rate your service or business, coax people to leave a rating - just make sure you deserve a high rating.
Follow up with people after they use your service or product - and ask if they know others who could use what you offer. You can ask these customers to mention you to their friends (more powerful) or ask if you can call them yourself and say the customer referred you to call. Make sure to leave extra business cards (or any "freebie" gifts with your information on it - like lip balm, or pens) with these customers so they can pass them out when they see their friends and acquaintances. PR