Can you promote without content? No. However it does not start with content either, it starts with 'strategy'. What exactly do you want to communicate, what you want your audience to expect in your blog, how you want to hook them, engage them, and participate in discussions. What are your strengths - webinars, ebooks, tutorials, reviews?

1. Prepare an inventory of what all you want to offer, and why.
2. Plan a calendar so that you can stick to a schedule. Remember that all blogs start at 'Hello World' and a many end at this post itself.
3. Plan how to reward your audience.
4. Now comes Content and Promotion strategy.

If you want more details, write to me or setup a call anytime! :)