The creation of marketing plan itself is a right step, good if plan is written, better if it has specific numbers. Focus on search engines. Remember nearly 80% of all searches being made using Google. Search engine means keywords and keywords mean quality content. Give visitors something, call them for action, engage with your audience via social networks. So who is your customer? Where they go? What do they watch and read? What do you sell? Define goals and track your progress. In simple put in words and numbers what company has now and what are the goals to echive, that would help to answer next question "How".