There is no surefire way to get a #1 ranking on Google. However, targeting the right keywords and audience can significantly increase your chances. Follow that up by creating and promoting tons of well-optimized content, and you're good to go!
Typically you get to number 1 by having a good online reputation. Well-known brands have good reputations. These brands rank at the top of Google, too. Reputation is increased by the number of quality web pages that link to any page on your site.