How do I tell a headless Ubuntu 14.04 server how to access a shared drive that is on Windows domain and renew password for a Windows user?

Inside a corporate situation, the machines are largely controlled using Microsoft technology.

I have another server on the same network that is running Ubuntu 14.04 headless. No GUI.

I want to write a script inside the Ubuntu headless so that it can access the Windows shared drive.

I also have the username and password of a valid Windows user who can access the shared drive.

This set of credentials has been approved to be used exclusively for this Ubuntu machine.

I believe I should use smbclient to do that.

My two questions are:

1. what are the commands to access a shared drive?
2. how do I reset the password of the Windows user since there is a company policy of changing the password every 3 months?

Thank you.