If you havent see it already, check out the links in shor's comment below - there are some great resources in there. In some cases you can also consider surveying your current audience or customers through email, on-site surveys or SurveyMonkey.  Be sure to ask for some profiling information that you can use for determining specific persona needs like age, sex, location, etc. (Probably best not to make it sound like a creepy text chat like I just did though...)  :)
He started by finding an offer that resonated with and is relevant to his audience. In his case, his blog was dedicated to teaching people how to use a software called “Sublime Text.” He simply offered a license to the software for the giveaway. By doing this, not only did he increase the chances of success of his giveaway since his incentive was relevant, but he also ensured the quality of subscribers since they were actually people interested in his content. It’s easy to give people an iPad or an iPhone, but how relevant will they be to you at the end of the day?

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You have also mentioned Quuu for article sharing and driving traffic. I have been using Quuu for quite sometime now and I don’t think they’re worth it. While the content does get shared a lot, there are hardly any clicks to the site. Even the clicks that are there, average time is like 0.02 seconds compared to more than 2 minutes for other sources of traffic on my website. I have heard a few guys having a similar experience with Quuu and so, I thought should let you know.
On one specific project, one of the SEOs on my team was brought in during the wireframe stage. T­he entire product team held SEO-specific meetings every week to go over specific recommendations, taking them very seriously, and leaning on every word our team said. We were thrilled. We were hailing their efforts, promising big wins for the relaunch, and even hyping up the launch and it’s projected SEO results in the company SEO newsletter.
If you are using Responsive Web Design, use meta name="viewport" tag to tell the browser how to adjust the content. If you use Dynamic Serving, use the Vary HTTP header to signal your changes depending on the user-agent. If you are using separate URLs, signal the relationship between two URLs by tag with rel="canonical" and rel="alternate" elements.
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