Within 2 court days he will be arraigned and at that time, presuming a not guilty plea he will be appointed counsel unless he can afford to retain his own counsel. They will then set it for a preliminary hearing (within 10 days_. Sometimes this is waived by counsel but other than that it will go on. At that hearing, what usually happens is a few of the officers testify to enough of the case for the judge to determine that there is enough of a case (probability that felon(ies) were committed and that your son did them) to hold him for trial. Defense cross examines them. If he is held, and typically they are (if there wasn't enough of a case the DA probably wouldnt have filed) then it will be set for pre trial and trial and the various pre trial activities will begin such as motions and plea bargains.
Edit to add: if the jail has skyrocketed his bail, the judge may bring it down at arraignment(theoretically he may raise it too) or counsel can try a motion later.