It depends what the facebook page is about. The best is directly sell stuff there if it is possible in your niche, sell them exactly what they want. If it is general fanpage, then you can send the traffic to adsense site, that can make also lot of money, you can also sell posts, here and at other webmaster forums you can find a lot of potential customers. CPA offers might also work, but you need to cloak your links, redirecting did not work for me, FB always found it out, cloaking works...