Apex WebService

Please help, I am new to salesforce but I have done some work with webservices before. I am running into a problem accessing an Apex webservice.

Apex Class

Global  class TestSOA {
  Webservice static void testService(){
    List<account> newAccts = new List<account>();
    Account oneAccount = new Account();
    oneAccount.Name = 'Test 1';
    newAccts.add(oneAccount);
    oneAccount.Name = 'Test 2';
    newAccts.add(oneAccount);
  }
}

My Code

TestSOAServiceLocator service = new TestSOAServiceLocator();

            TestSOABindingStub sb = new TestSOABindingStub(service);
           SessionHeader sh = new SessionHeader();
           sh.setSessionId(lr.getSessionId());

           sb.setHeader(new TestSOAServiceLocator().getServiceName().getNamespaceURI(),"SessionHeader", sh);

           sb._setProperty(TestSOABindingStub.ENDPOINT_ADDRESS_PROPERTY, lr
                    .getServerUrl());
           sb.testService();

I read the documentation but I didn't find anything about authenticating for an Apex Webservice, my method seems to work but i am getting this error now:

"No operation available for request {http://soap.sforce.com/schemas/class/TestSOA}testService"

Thanks in advance.