The Upload Wizard is the default method for uploading files to Wikimedia Commons. You can select one or multiple files and begin uploading. Informations such as date and camera position are added automatically (if available in the photo's metadata).
Where is the work from? (Click on the appropriate link)
Upload form for experienced users
See also the full list of copyright tags for many nations. The first section of that page also has other general tags for public domain sources.