I have created a new page. How to get likes. I mean besides inviting friends what are the other methods. If I ask other page owners would they help me with that? Are there any black hat methods?
Yes, but they are just that, black hat and unethical. You'll want to steer clear of those methods.
If you have a website, it's a good idea to promote your facebook page there. This will help you gain the right kind of exposure; people that are truly interested in your business/product/service.
Can you give us more information on your page? What it is that you are offering?
Sorry, we neither promote or allow discussions of black hat here. Moreover, this forum is about content, not SEO.