changing static html website to responsive

i have two (2) questions about the “html import 2” plugin.

1. the files transferred successfully, however they are still in html code, so if a responsive website is supposed to be css, would it be best to abandon this approach, and build from scratch ? the html website is 25 pages and i was hoping to migrate it.

2. the old template also transferred, which according to the plugin directions, was not supposed to happen.

thanks.