What is Marketing Public Relations?. These are all very popular tools that do the job, with the added bonus that they're all very easy to use. Since then, many have proposed that there are really 5 P's, suggesting Positioning, Packaging, or People as additions to the mix. Going that extra step starts with you making your own email list. In addition, there are a huge number of templates that can give you very professional-looking emails to send out.
Look at other companies and who they are marketing to, see what need you fill for each demographic and what their buying habits are and explain why you want to market to the specific segments you've chosen.