Oh wow, what a coincidence, I made stuff like that for KC /b/ some time ago. I used a software for this which you can download for free on the net: https://www.pftq.com/jeopardy/
You can just edit the questions and settings. I then just let Bernd pick the category and posted whatever question was next. It was fun, but it had it's downsides: Dollchan users had an advantage, since time was crucial, and in most cases the answers came in after 15-20 seconds, I even had a correct answer 9 seconds after posting the question, which raised lots of suspicions that there was cheating involved (which never was). Still, it was fun just playing it inside the thread. Do you also want to do this, or are you planning on using an external site?