Good question. I'll show three sources to do the empirical task for Blinder-Oaxaca Decomposition. First, Jann, Ben (2008). "The Blinder-Oaxaca decomposition for linear regression models." The Stata Journal 8(4): 453-479. It will be the excellent guide to study the theoretical ideas and to do the Stata commnad 'oaxaca.' Second, the zipped file for 'oaxaca,' including oaxaca.do, oaxaca.dta, oaxaca.hlp, etc. Finally, Bausr, Hahn and Sinning (2007)'s presentation file to guide how to do "Blinder-Oaxaca Devomposition for Linear and Non-linear Models." Good luck!