This 4th step is a HUGE one because without content, you're not going to get approved for Google Adsense. So to help you, here's a big tip on how to create the blog content for your Blogger blog:
Create High Quality Content That's Relevant, Helpful and Current!
When Google rolled out the initial 'Panda' update (a/k/a the 'Farmer' update) to it's search engine algorithm in February of 2011, Google wanted to improve user experience by weeding out thin low quality blogs and websites that were gaming the system from their search engine rankings. The initial and subsequent monthly updates have made it clear that Big G is placing a lot of value on (a) content quality, (b) the relevance of content to a search inquiry, (c) how helpful content is likely to be to a site page visitor, and (d) content freshness.