Your want to post content with value. Link to great deals, new product information or the latest cutting edge updates to give your fans something in return for the time they spend on your page. Avoid "selling" on your Facebook page, so as to avoid popping up too much on your subscribers news feed.
Don't think of your fans as numbers. That's a big no-no in Facebook marketing. You aren't collecting numbers, you are building brand champions. You are creating a community of people who love your company or brand. Treat them with the respect that they are due. These people can make a difference for your company.
Try using a call-to-action graphic to convert visitors to your page into followers of your page. This will encourage people to "like" your page in order to receive some discount or content. When people come to your page, all they see is "like our page for more info", then after they like the page, they can see the content.
There are plenty of resources you can use to learn more about Facebook marketing but keep in mind that the methods recommended by Facebook marketing gurus might not be adapted to your target audience. Learn as much as possible about Facebook marketing and choose the methods that seem to be adapted to your audience.
Talk to your audience on your Facebook business page. If someone is taking time to write something on your Wall, you should answer them. It's similar to someone calling your business. On the phone, you would talk to them and answer their questions to make a good impression. This concept is the same with email and web form submissions. It needs to be the same with your Facebook page.
Get your subscribers to interact with you by asking some questions. You could for instance ask people to share a funny anecdote with you or to give their opinion on a certain topic. This is a great way to get your subscribers to interact with you and with each other.
Post about your milestones on Facebook. You could for instance let your subscribers know about your sales volume, the launching of new products or the anniversary of your most popular products. This is a good way to draw attention to certain products while creating a positive image for your brand.
Respond to your fans. Remember Facebook is social! Your fans have begun following you because they are interested in what you have to offer. They want to communicate with you. If they are writing questions or having a conversation, get involved back. Answer those questions and get in the conversation. It'll build a lot of loyalty among your followers.
Facebook is a great medium for helping you get the word out about your company. Just remember that success will not happen overnight. Use the above tips and remember to be patient.