Hi Vicki,
There are a variety of Add-ons that can do this, not all of which are free! The best free one is likely to be Form Publisher. If you are wanting to really streamline the process then I’d recommend KissFlow (probably the ultimate in flexibility), Form Workflow Plus ($300usd/year) or Freevo.
Form Mule is a email utility more than a workflow approval tool, whereas Form Publisher has the ability to do workflow approvales.
Form Publisher is likely a good option for this job in my view…