This is probably the most difficult part of running a blog. You need to start writing, and you need to start writing at least one new blog post per week, although two or three would be better. It is usually best to set a schedule.
Keeping your blog on topic 95% of the time is going to help you create a resource for your niche. What you write can be anything from how-to advice, product reviews, editorial pieces, and much, much more. As long as your content is relevant, well-edited, and takes advantage of the use of keywords, you should start to see traffic. Promoting your blog can be done by offering to write guest posts for other blogs, promotion through your related Facebook page and other platforms, and using marketing services.
However, the use of SEO (search engine optimization) is going to be pivotal in getting those Google results that lead to better traffic from people specifically looking for the type of content you are offering.
Search engine optimization in regards to articles means utilizing keywords in a natural manner (once per one hundred words or less is a common rule of thumb), not using content that can be flagged as duplicate content on the internet (i.e. original content, no plagiarism!), and maintaining the website in a professional way. There are SEO specialists that can give you more aggressive plans of action if you’re willing to spend the money. Likewise, you can always hire someone to write blog posts for you if the writing time is just too demanding. Starting out, it’s generally my advice to do this yourself to save money and create a “voice” for the blog, but if you have the funds, it’s worth the time you can save to pay someone else.