If you are creating a custom workflow or a resuable workflow through SPD 2010 for the first time, you'll end up with a question about how to move the same to production. Hope this helps.
1. Create the workflow in SPD
2. Save it as Template (Saves a soln file in the Site Assets folder)
3. Download the wsp file - Ref - http://technet.microsoft.com/en-us/library/ee662509.aspx
4. Move the wsp file to prod and deploy it - Ref - http://technet.microsoft.com/en-us/library/ff607872.aspx