Depends on your knowledge no? I would not just assume that the ENTIRE world is empty. I would assume I would not be the only one left; so.. my first steps would be securing some basic (long lasting) energy source (food/drink), and then trying to figure out best way to find/contact others.
Obviously, if after a month, maybe 3 of trying, there's not a single reaction, single life in sight.. might as well end it quickly and painlessly.
This site provides links to other sites/services, and does not store any files