You can message the URL to all your face book friends and ask your friends to forward it to their friends, in this way you can increase your fan page likes.
-Share your page with your friends -have a like box on your website -use ilike viral plugin -make fan page with reveal tab: people have to click on like before seeing your hidden content -use twiends.com to get some initial likes
create the fan page with compelling content and let them engage frequently.send email newsletter and make them for repeated visits
Post your friends wall and tell them to like your page and also you can post more groups that is related to your page.