In Flux, you can either start a project from scratch, create one based on one of the supplied templates, or import one of your existing sites.
To create a new project, simply choose 'New' from the File menu. You will then be prompted to choose a location and name for your project.
You will also be asked if you want to create a HTML file and CSS file to get you started, if you've never created website before, this is a good starter.
Flux is supplied with a number of templates that can make a great starting point for a new website. To create a site based on a template, simply choose 'New with Template...' from the 'File' menu
You can import an existing site by simply selecting the containing folder of the site after choosing 'Open..' from the File menu , Flux cannot open individual pages such as index.html