This walk-through will demonstrate how to setup your own SPARQL endpoint for other sites/people to query.
Required module: SPARQL
Enable the necessary Modules
From the Modules administration page (admin/modules), enable SPARQL API and SPARQL Endpoint
Notice: Requires: RDFx (enabled), RDF (enabled), Entity API (enabled), SPARQL API (enabled)
Once these have been enbled you should see Build RDF index and SPARQL endpoint in the Navigation menu.