You say that your ex is pro per, but do not indicate whether you are represented by counsel. The only advice I can give you is to have a competent lawyer who can review these issues, determine how the law applies to your facts, and advise you accordingly.
As a general principle, temporary restraining order hearings can be scheduled and TROs issued ex parte - that is, without notice to the opposing party. Most courts in most cases require some sort of notification, but the standards are generally lower than for a noticed motion.
In California, a TRO issued without notice must be served within certain time limits. And it is, by definition, a temporary measure; it only remains in effect until there has been a hearing on a preliminary injunction. But in the meanwhile the parties are bound by the TRO. If you see this as a potential problem you really need to talk to your lawyer (or get a lawyer and talk to him or her) about this matter.
You need notice of the TRO, but keep in mind they are generally granted for safety reasons. If you know of a hearing, you should attend and not "play the service game" because one could be issued (if the court deems the grounds are good enough or there is reason for the court to believe that notice to you should be waived for safety reasons). If one is issued and you violate it, it could be a pain to deal with arguing failure to serve - especially from a jail cell.
A hearing is always scheduled, otherwise why would you need to be served with papers including the date and time of hearing? if you havent been served and he advises the court of that, the hearing will not go forward. it may be contuinued and he will have to serve you. The risk is that he could BS about serving you and court may not know better. Then he can get his order at he hearing.