Question : I'm trying to learn how to develop Android Apps..

..and have downloaded android SDK and AVD manager and also Eclipse.

I am trying to use the 'keytool' command in order to access the Google Maps API but have no idea where/how to run it in Windows :-(

The documentation just says 'in the command line'. Where is the bluddy command line??

Answer : I'm trying to learn how to develop Android Apps..

the keytool might not be in a location that is in your path.  try searching for keytool.