Starting workflows and moving documents

I am trying to create a Workflow in SharePoint designer 2010.

Here are the steps

1. If a document's property field "status" is changed to "pending team review" Then an email is sent to the Team


2. If a document's property field "status" is changed to "final", then it is copied to another library (B) and an email is sent to reviewers of this document.


3. If a document's property field "status" is changed to "Final DO NOT CHANGE", then it is copied back to the origional library (A) and deleted from the current and an email is sent to the initiator of the work flow.

I created a workflow in SPD for the first two steps and associated it with Library A. The copy and email functions work fine. However an email is being sent whenever the document is updated.

How do I start a work flow only when a specific field is changed?

I tried to create a workflow for step 3, using similar atributes as the first, but it does not work at all, no coping and no email.

How do I move a document from one library to another, and then back, based on the value of a field?