Ask HN: How to advertise a web design/development company?

Hello. I have a website where I offer web design services and web development for small businesses. So far the only interest I've had has been from family and friends. What advertising strategies could you recommend to get some more clients? I've tried cold calling local businesses with very little luck. I'm looking to make a little money for myself while I'm at uni, so if I could get a couple of jobs a month, that would be great. Thanks. Thanks.