Don’t worry about getting lost, happy to help any way I am able to, that is what Discourse is for after all right?
Font Awesome
The component should automatically support any Font Awesome icon from the current version that is in the current version of Discourse. I believe they currently support v6. Which you can locate all of here Font Awesome.
For the second part of the question, yes its free, there is a premium verison, but I am not sure how that works with Discourse since Font Awesome is already included with the core.
Color Picker
I can take a look and see if I can implement one, but since its a theme component, I am not sure how much I can do before it becomes necessary to be a plugin. You can use this helpful tool though, you click on the “Use HTML 5” area where the color is, and for this component, you want to use the hex color. HTML Color Picker
