Here is a link to a blogtalkradio show that Denise just did with my friend Donna Kozik. They talk about that very thing. Feel free to message me if you want more specific advice.
Please provide a bit more about your target audience and niche. Also, share what you've already done, what worked and what hasn't. Although we can share generic ways, it's best to provide strategies specific to your needs. That way, you would, in my opinion, gain better benefit from the suggestions.