Move out questions and end of lease process

[Jim Adrian]

I have a tenant that moved in his girlfriend and kids a few months ago.  I got her on the lease.  Now things have soured with them and she and the kids moved out.  They are month to month.  I need to remove her from the lease.  I know my "end of lease portion is weak and lacking", so here I am trying to update it.  I am not sure its worth writing a new lease just for him.  I think a lease addendum would be easier.

1. Do I simply tell her (gf) I am taking back my property?  But then I would have to do this to the him as well.  This would force a new lease.
2. Do I need the girlfriend to sign anything stating she is out?  Assuming she does or I want her to her to at the very least.
3. Would you change the locks? She moved an hour away.
4. Anyone have a template they are willing to share?
5. I never got a formal 30 day notice but has been gone for about 3 weeks.
6. Do I need a forwarding address?  She didn't contribute to the security deposit.
7. Anyone care to share there move out process?

Thoughts / comments...