Currently I am using FrontPage Templates, but I am not sure if Templates are SEO friendly.
Second point first: Any template is only as SEO friendly as you make it ;-)
If it's a purchased template it should have provisions for header, footer, right and left sidebars (or whatever combination is used) to be included in each served page by either the "Include Page" or "Include Border" functions.
You can easily build a simple template yourself by creating the common "pages" you need and using either of the two include techniques.
Expression Web has a more powerful templating system so you might consider an upgrade from FP.