hi, just to answer quickly,
1. the story of alexander's journey is described in 4 main ancient authors according to michael wood ("in the footsteps of alexander the great"), all available in the loeb series: arrian, quintus curtius, diodorus of sicily and plutarch.
3. don't really know what this is, although the sacrifice rituals performed at the olympic games are described in an easy-to-read way in a recent book called "the naked olympics" by perrottet.
4. the best way to find out about "who wrote what" is through the perseus encyclopedia
: e.g. for heracles:
http://www.perseus.tufts.edu/cgi-bin/pt ... %3D%234235
it gives you links to classical authors on each fact about the person's life.