Air carrier pilot reported while beginning to taxi after push back they had no nosewheel steering.

Narrative

The ramp crew at ZZZ had pushed us onto the centerline of the Taxiway 1 in the non movement area on company ramp. In accordance with with standard procedures; they showed us the NWS (nose wheel steering) pin and waved us off. However; unbeknownst to us; they had forgotten to flip the NWS engagement switch.We began to taxi forward for about 50 to 100ft. As soon as tiller input was required to maintain centerline; I realized we had no NWS and the tiller was jammed. We immediately came to a stop and set the parking brake. We were stopped just short of Taxiway 2 but were blocking the access road. We informed ATC we were unable to continue taxi and shutdown the engines to conserve fuel while we evaluated the situation. We then called Dispatch and requested they get the ramp crew back out. After about 20 minutes; the mechanic approached the aircraft; engaged the NWS; and appeared to signal us to start our engines and continue. Although due to his lack of any standard hand signals; and lack of direct communications with him; we did not feel comfortable restarting the engines until we could verify with certainty the area was clear and it was safe to do so. Eventually the ground crew returned with lighted wands and we were able to safely start up and depart.Suggestions: The ramp crew lacked a basic understanding of 767 operations. Additional training should be conducted.