First of all, understand that he will have several court dates, not just one.
Typically, on the first hearing date, he will be asked how he pleads and he may wish not to claim responsibility/guilt, and then the matter will be reset several times as his attorney and the prosecutor try to come up with a plea deal. If this does not work, then he is to take his chances at trial. About 90% of such matters end up with a plea deal.
Normally, if he does not have an attorney, the Court will not even take his plea, and will reset the matter for her to find counsel. He may also request a reset himself to find counsel and the Judge normally obliges on the first hearing. If he cannot afford an attorney, then one is typically appointed to him, but the Court has to be convinced that he really cannot afford it - if he is able-bodied and can work, and is not in jail, then the Court normally declines appointment, but it is on a case by case basis.
It is very likely that the prosecutor and his attorney will come to a plea deal. His attorney is likely to push for a deferred sentence which is a type of program wherein a low-level, non-violent crime with someone who has little/no priors is given classes and community hours and probation in exchange for dropping the charge and any conviction. Or, he can ask for a reduced charge, etc.
Few matters actually ever get to trial. Defendants in in Juvenile Court have a lot more rights than Defendants in regular criminal court. FOR A VERY HANDY GUIDE, SEE HERE.
However, again, it is much more likely that a plea deal would be worked out that includes community hours, etc. Juveniles are generally not locked up for non-violent crimes.
I hope this helps and clarifies. Gentle Reminder: Use the SEND or REPLY button to keep chatting, or please RATE when finished. You may always ask follow ups at no charge after rating. Kindly rate my answer as one of TOP THREE FACES/STARS and then SUBMIT, as this is how I get credit for my time with you. Rating my answer the bottom two faces/stars or failing to submit the rating does not give me credit and reflects poorly on me, even if my answer is correct. I work very hard to formulate an informative and honest answer for you; please reciprocate my good faith.