Форумы / Cotonti / General / Noob looking for detailed answers

Hi everyone,

I just started using Cotonti yesterday and so far I love it. I'm a tad edgy considering the size and frequency of the community here but I'm giving this a go regardless because I think I'd want to incorporate this management framework within my current website.

Anyway to start, this is my current website:
http://www.keyjaycompound.com

What I've been trying to find and haven't really found any solid information yet is:

1. Proper or practical format of Themes. I know that most of the themes are consisting of tpl files based on the documentation, but looking through some of them, I did notice a couple PHP files and I dont know why or if thy are necessary.

2. How exactly to get the core tag list. I looked through the forum and found a detailed list of all the variables, but I did notice that a few values were missing, such as {PAGE_FILE_ICON}

Those are my two biggest things right now. Everything else is looking good. 
With all hopes, I hope this project remains active as I haven't (besides Hotaru CMS) ran into a project like this and I think your support is greater than Hotaru. I'd just like a few more guides made or something, even though for the most part I'm not having too much trouble figuring this out.

Thanks guys and looking forward to your response!