Hi
1) Here is the theme documentation http://flythemesdemo.net/documentation/photolite-doc/
2) There is no plugin need to use the theme content. Since theme comes with the default content.
3) Because the theme has default content once you activate you can go to Apppearance >> Theme Options >> here you can click save options button to save the content in database.
4) After importing the demo content then go to Pages >> Here you can check if all the pages are imported.
We have received your email and we can setup the theme for you.
Thank You