Hello Stacey, be sure that your webservice on your iis is available on a public domain to be 100% sure docuware can call your webservice. If you do not have your own docuware (on your own servers) it cannot access your webservice by the local ip address. I mean, this was one of my issue ! Hope it helped
Oh, and if I remember well, the sample project is in .asmx, this can only support SOAP. If you wanna be able to do both SOAP and REST, look for WCF webservices.