[Tango-L] D.J.ing for the 'cause'

[Mario]

I live in San Miguel de Allende Mex. This town is desperately in need
of a D.J. and a Friday nite Milonga. I wouldn't want the job but no one
else is about to do it.  I have a laptop with my favorite dozen songs on it ....duh  NOW WHAT?  Is there a D.J. Specific site that will help me?
Can I get away with not spending mucho dinero and time searching out CD's etc? I think I have a decent idea of how to arrange the songs and the night as a whole...but I need content (music) and software. 
 I'm suddenly seeing D.J.ing as a noble cause...I want the real oldies but goodies..30's and 40's stuff...any brothers and sisters out there that can help me?