Where can I find a color science course or a book about the subject?
Browse through Coursera.org u might find sth interesting, and if that doesn't work, there's always this awesome "new" technology called GOOGLE !
Where can I buy Sony Xperia Z is it even available?
Not in Jordan yet, i checked, should be here in 2 weeks
Where can I find a weekend job?
Based on your interests, don't be too scared to send your CV to companies you're interested in and ask for part time/freelance work, i've personally hired a few ppl who did this
Where can I find a good internet service provider?
@Kulacom but make sure first that ur area is covered well enough
Where can I purchase silk?
Downtown Amman, there's an entire market called the Fabric Market (Soog el Gmash) where you'd find Silk and everything else you'd need
Where can I buy a reasonably-priced electrical guitar?
Reasonable might be a bit difficult, but try out Feesheh.Com or FB's marketplace for a used one