A lot of people do the Facebook groups here and like each other back, but I don't bother with those because those are rarely the people I'm looking for. They've never purchased anything so I don't bother; they're not my target.
Do you have an online presence anywhere? Put your FB link everywhere you go online. Start with your own personal FB friends; invite them to like your page and share it with your friends (if you want to offer an incentive, go for it). Put your FB link in your "message from seller" after a customer purchases from you. Put it on your business card and include it in your packages. If you're a member of any online forums, put your link in your signature.
Find out who your target customer is, figure out where your target customer hangs out online, and (tactfully) invite them to like your page and check out your shop.