Let me address your questions in order below:
1. Yes, absolutely. Any CSS files that you put in the /Global folder will be automatically loaded upon the initialization of your Sitefinity website. Any CSS files that you place in subfolders of that would need to be explicitly referenced through your .master file or page properties.
2. Yes, absolutely. Example - in the Quantum demo website located here
, we have referenced images from the Images folder via CSS using this:
3. Yes, absolutely. Just make sure to reference the path correctly so that the images come up!
Hope that helps!
Grisha 'Greg' Karanikolov
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