This watch uses an Omega Cal. 1152, which is based on the ETA 7750. Not a difficult movement to service, but it does take some time - service prices will vary depending on who you use.
When was the last time the watch was serviced? If you don't know the answer to that question, then buying a watch with unknown service history means you should count on doing a service.
If you have fully wound it and it's not running, it could be a number of things wrong, from needing a full service to something as simple as a loose screw stuck in the balance...this is like asking why your car won't start without providing any details...impossible to give you anything more than an educated guess.
Cheers, Al
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