I need some help

I am enjoying working on my Alicia story but I have ran into a problem outside of my preview of experience big time.
You see, I plan on this pretty soon after a few chapters to turn into a courtroom drama as i hope those reading can tell from the police interrogations.

My problem is this, I have no experiences in this area and not even enough to fake it.
I was lucky enough to find a manual to help me write a good enough police interrogation scene. It was fun but when the time comes to write out the examinations for court, the aggressive crossings, I dont know how that should go or would go.

And i am having trouble with Kathy. A majority of her crimes took place before she hit 18. Would they be admissible? Could they be included i assume there would be a way but surely her lawyer would argue against it but i think there could be a way her crimes against Al could be included in her list of charges with the right set of arguments from the states attorny.