Much of this has been collected in popular form  in Legends of the Jews, by Louis Ginzberg; see particularly its first chapter  discussing esoteric and mystical concepts such as Paradise, and the "higher" Gan Eden.
Much of this content has been compiled in a popular manner within Legends of the Jews, by Louis Ginzberg; it includes discussions on esoteric and mystical concepts such as Paradise, and the "higher" Gan Eden.