I agree with the MicrophoneFiend that these are all deep and diverse topics. For question 2 I would recommend Socialism Betrayed: Behind the Collapse of the Soviet Union by Roger Keeran & Thomas Kenny.
Also keep in mind for questions 1 and 3 that the soviet union existed from 1922 to 1991, conditions and the economy varied immensely. you would have to be more precise which period you are interested in.
is it a problem to be against both?