Whether your blog is part of your business or you are blogging for fun, getting going with writing content is often the hardest part of the process.
There is a very inspirational video interview on the WP Elevation site with professional blogger Bill Belew. www.wpelevation.com/2014/02/episode-19-bill-belew/
Watching this will give you some good tips, and should leave you feeling energised. The two main points I took from the video (and there are lots) is ‘you haven’t really started until you have written a hundred articles’, and ‘just press publish!’. Bill is also a fascinating character, and Troy at WP Elevation is a great interviewer on all things WordPress.
If you are still struggling to get going with writing for your blog, advice from Morten Rand-Hendriksen of lynda.com is to set aside thirty minutes once a week at the same time. What ever is written after 30 minutes, just publish. This way content will build steadily, and deadlines concentrate the mind.
From my experience the regular addition of content also makes me more alert for other possible subjects for blog articles.
It is important to understand it is unlikely you will know how your writing will be until you get going. It will evolve over time. You can always delete or edit old articles if you become uncomfortable with old content.