At school-level, you'll probably be fine with what you can find out from textbooks and from the occasional decent TV documentary or 'pop' science book. However, the world of quarks and leptons does inevitably tend to be rather qualitative at any level below about the third year of an undergraduate degree and this can sometimes lead to a situation where you get three tricky questions from pupils for every one piece of information you give out.
Firstly, here's my general powerpoint that I've compiled and tweaked over the years. It might not have anything terribly pedagogically exciting, but it's aimed at the oldest pupils I tend to teach and so I wasn't afraid of going for a more university-level presentation. I'm by no means a specialist in this area, but I've tried to check a lot of what's here with people who are.
Secondly, here are some resources I wrote that are a bit more interesting than the usual boring 'state the quark composition of a neutron' sort of question.