Please Help!

I know very little about jBoss and about Java. I have however managed to get jBoss up and running and I am able to deploy and run clients against session EJBs. I now need to write some enity beans. But for this I need to connect a database to jBoss (I think?).

I have tried to search for this info on the web and in forums but found nothing of use.

Can someone please give a step by step guide for doing this or lend me any help they can???

Many Thanks,
Alan.