When I call the child support agency to check stats on case they never have anything new on him (I don't understand that) .From hearsay he have a background called the criminal clerks office found three cases pending with court date , I gave that to the agency, but what if he does not show up for his criminal case to get served for support ( should I go get a lawyer and be there as well?

There is absolutely no benefit to you being in Court when he is there. You can't serve him with legal papers. An Attorney would be helpful, of course. If the Child Support Agency has papers for him, hire a process server to serve those papers at the time his criminal case(es) is heard.

If a person does not show up for a criminal case, a bench warrant is issued for their arrest. Depending on how things are done in your area, they might start by sending a letter, then going out and trying to locate him, etc.

I assume what you are talking about is a case that you filed with a support collection agency and the person has other charges pending which have an upcoming court date. Getting all these papers served has nothing to do with you, when a person goes to court, their record is checked and if there is something outstanding against them, such as a child support case, they will be served, locked up, etc. I was a court bailiff and locked up people under such circumstances on a regular basis.

It was certainly a good idea for you to notify the support collection agency of the upcoming court dates, maybe they can serve him based upon the address in those court files, or catch him in court. It's their job, not yours.