My debit card was stolen & I'm pressing charges; What can I expect in Court?

My debit card was stolen by a local 19 year old. He used it at his workplace (which is where he picked it up), a gas station, & a few stores online. The amount all together totaled $251.23 (He was dumb enough to ship all these purchases to his house & used his personal email as a contact which is how I found him) I'm pressing charges.

Now, I have been subpoenaed to appear as a witness in court. What can I expect? Is he just being charged for petty theft, or is it something else because he made purchases online? He should have had to sign for the charge at his workplace. Would that be a forgery or identity theft charge?

The sad thing is, had he apologized & offered to pay me back, I wouldn't be pressing charges. He just kept lying, & told people I was stalking him when I confronted him & his boss at the place he worked. Then he tried saying it was some unnamed friend that was in town for that one day, that he has no way of contacting. Apparently this fictional person "borrowed" his iPhone because the thief is just that trusting & all the items were then sent to his house.

What exactly should I expect to happen? What will be expected of me? What will his punishment be?

Added (1). Also, what type of questions will the defense try to use to discredit me as a witness?

You will be asked questions by both attorneys. Just answer honestly any quesitons and there's no way you can be discredited. If you do not know something, there's no harm in answering a question with that. I had my wallet stolen from a gym locker once, so I know how you feel about losing something like that.

You should be awarded restitution as for the punk who stole your Debit card let the law handle him stay away from him he is a thief and deserves no sympathy from you