I have a website which is mostly handwritten using html, PHP and js, and also uses Sass, jquery etc and so on.

What would be a general procedure to begin moving the site to Silverstripe?
Currently the PHP used on site is pretty simple, mostly 'includes' for common parts. There's a little bit of Mustache and a fair amount of jquery and jquery.tools. As I'm fiddling with Compass on another project I'd quite like to incorporate it into this one.

At this initial point one might want Silverstripe so that the site-owners can upload photos/descriptions and change words on the site.

In the future, the site-owners need to be able to work with components, drawings and photos which have fairly well understood relations to each other.

Eventually I would have a need for a site-owner-level backend for defining and modifying these objects and their relationships, in addition to the site owner changing and adding words and images to the site.

Any thoughts on a process to follow would be gratefully received.