what documents am I meant to give to the ex's lawyer?

The ex has taken me to court (still not sure why but here we are).

Am I just meant to forward his lawyer all paperwork that relates to legal stuff (I am self represented single full time mum, so please ease off on the "Lawyer up" comments)? e.g. I spoke to someone who said I had to forward the S60I certificate, my enrolment into parenting courses(apparently I should mirror him and do all the courses), a letter from my psyche to say I was mentally sane (ex accused me of having mental issues as I was diagnosed with ADHD when I was 22, now 40). There's more but you get the gist.

To get on the front foot, I was going to send through my medical records dating back to 2003 as I am feeling like every time I forget to say something, it's a "gotchya moment". The records are a lot longer than I thought though... Some of the things I went to the doctor for back in the day were quite funny... but I'm scared the ex and his lawyer will spin it into a big hoo haa.