ive learned alot about drugs from erowid:
http://www.erowid.org/psychoactives/psychoactives.shtml
here is the link for coke:
http://www.erowid.org/chemicals/cocaine/cocaine.shtml
and what you really should be reading are the experiences before you do any new drug:
http://www.erowid.org/experiences/su..._Cocaine.shtml
if you havnt tried it, i wouldnt suggest doing it- even if you do have a steady income or your already loaded...if you can support that habit it doesnt even matter because the drug will fuck with your head and eventually fucking with your business...