Help me to import users into Civicrm and a few other things

I need to import some users from an MS Access database into Civicrm, then create Drupal accounts for each user and send them their username/ password in a custom email. I also need to understand how to do the same thing for a single user when added via the Civicrm interface. I have to do this myself for reasons of data security. So I need someone to give me a set of instructions and possibly talk me through the process. You would be able to login to the website prior to the import to see how everything is set up.