When planning your time on an online marketing strategy you should plan on spending at least one hour a day working on social media. This would include creating content, posting content, and responding to posts.
Online marketing is expensive, cutting corners on this aspect of marketing can be disastrous. When creating your strategy keep in mind the costs of having copy written in house or by a professional copywriter. Research SEO professionals, make sure that they have experience working on the type of project you are launching, and consider their reviews and results.
Content marketing includes blogging and other media forms. Content marketing should be authoritative and knowledgeable.
One of the topics I would be more interested in is AdWords, in several job listings I have seen this as a requirement. This is something I will research further including taking additional Lynda.com courses on the subject.