I have just started playing with ApplesScript, and I wanted to document some common things that I get asked to do.
You will find the Script Editor in the Utilities menu of OSX
Saving Executable Scripts
When you click on File -> Save As you should save the script with the file format of Application, and it might be a good idea to untick Startup Screen for silent execution
Opening a network location
tell application "Finder" open location "smb://server/share" end tell