Workflow w 2 serial deployments

System

I need a workflow that does the following:

1. deploy files to an external QA web site.
2. send email to reviewers
3. reviewers approve the job (within TeamSite)
4. deploy files to external production web site.

What is the best approach for building the workflow?
Is it possible to trigger multiple deployments from a single workflow?

Would appreciate any help on this!