I have already had a default judgement placed against me. Now I have a court date and the papers state it's a motion for the courts to enforce judgement against me.What does this mean and should I be worried about going to jail.

You won't go to jail for it... but what's going to happen is they can come after it in any back accounts you have for starters, maybe get wages garnished. And they can wait for a very long time to get it... even many years from now.

Debtor's prison hasn't existed since the 19th century. So no, you will not go to jail. What does the summons say? Does it require you to bring in pay stubs, tax returns, bank stmts, etc?

Did you not show up for the previous hearing? That's usually how a default judgment is entered. This hearing looks like an attempt for the plaintiff to get you into court so he can find assets.