Certain things could be different for our theme (like the widgets), but the documentation should be available to you in the download zip file. See below video for one of my earlier themes –
https://www.youtube.com/watch?v=6WVtNS3fUgE
You should see a similar structure for Appdev as well. Hope you got a chance to look at this Appdev setup video as well and were able to import the data and setup the demo site –
https://www.livemeshthemes.com/support/faqs/appdev-theme-how-to-setup-theme-and-revolution-slider-youtube-video/
For footer widgets, they stay across pages/posts at present. The many footer widget areas are there to help you organize into multiple columns of widgets and you can control the column layout via Footer tab in theme options.
The header text should be different color from the background. Otherwise, it is a bug – can you pls share the URL (post a private message here) and I can take a look.