What did you try and what errors did you get? If the DS is setup properly, that should basically do it. If you are using clustering, you need two datasources (one JTA and one no-transaction), but that's about it.
1) read the quartz documentation. there is all the stuff u need to know about configuring the quartz dispatcher
2) u need to provide a properties file, something like: quartz.properties. Seam will look for this configuration while when initialising the dispatcher (it cann be ejb, quartz whatever)
hope this helps