Salaries for bloggers vary widely. This report from Glassdoor shows ranges from $19K to $79K a year for the title "blogger," while other sources say the 14% of bloggers who earn a salary make, on average, $24K a year (or $33K for corporate bloggers). Likewise, freelance bloggers can make anything from under $10 a post to $100 or more for a relatively short post.
As you build up your blog, expect to receive multiple sponsored post requests each day. These native ads can be a highly effective way for businesses to reach your audience in a non-threatening way - and they can be a highly effective way for you to make a lot of money. Just make sure the posts are actually interesting and relevant to your audience, and that you fully disclose the sponsored nature of the post.
A blog itself isn't really a business—it's more of a platform for other income streams. Your content alone won't likely make you money. Instead, you'll have to get advertisers, sell services like consulting or speaking, use affiliate marketing to get a percentage of sales from links people click on your blog, or maybe offer products like ebooks or premium content to actually generate income. ProBlogger has an excellent post about these different ways you can make money.
Write content. I like to write an article from beginning to end with no breaks. It may take me an hour to write an article or I may be at it all day. Sometimes, content does span a few days, but for the most part, I like to finish a piece of content in one sitting. I then hand over the content to my editor to fix anything from grammar, punctuation, to the general flow of the article. The only thing she doesn't edit is my monthly income report.