Android : Starting an Android Service

Sorry if this is a dumb question but how do initiate an android service? I cant figure out the error code on public class scilentservice extends IntentService { (see code below). I think it might have something to do with the intent but i'm not positive. What I want is for my app to start the service which would then auto science the phone at certain times. Here is my code

/**
 * Created by Abe on 3/29/2015.
 */

import android.app.IntentService;
import android.content.Intent;

public class scilentservice extends IntentService {
    @Override
    protected void onHandleIntent(Intent workIntent) {
        // Gets data from the incoming Intent
        String dataString = workIntent.getDataString();
        ...
        // Do work here, based on the contents of dataString
        ...
    }
}
`

Thanks in advance for your help.