How should I decide on keywords to include in my Page Titles, Headers and Body contents?
You should not try to add in keywords that do not belong. Make sure to use only those words that are relevant. You can, if you need ideas, use a tools, such as this:
https://adwords.google.com/select/KeywordToolExternal
Additionally, Seattle New Media provides SEO services that could assist in getting those keywords into your site.
