Generally at an advisement hearing the judge will tell him what exactly he is accused of and what his rights are. He may or may not have the chance to talk to a prosecutor. He needs an attorney for this case whether it is a public defender or a private attorney. If he does not have one at the advisement hearing, that's ok, but he should probably tell the judge or prosecutor that he wants to get an attorney. I can't provide advice about his specific situation, but I can say generally that it is NOT a good idea for a person to talk to the prosecutor about the case or try to explain their situation the prosecutor. The prosecutors (DAs) are there to get convictions, and are not really interested in helping people out. He will need an attorney to help him.
Please remember that legal matters are complex, and that even the smallest details can have a great impact on a case. It is always best to meet with an attorney in person to discuss the full details of your case. Furthermore, remember that I am not your attorney until you have been to my office and we have both signed an agreement. If you would like to discuss having me represent you, please call or email me, or visit my website at http://jenkinslawco.com.