I am working on building a single page ecommerce site and I built the template using a asp.net master page ( I need the masterpage since the template will be used for different brands) .How do I use the master page and default.aspx file (content page) such that when when a user accesses the site,he gets access to the default.aspx file which is built by the master page

I apologize for the question for being so naive but I am just finding my way around aspdotnetstorefront