Getting started with an educational app

I learned recently how to do some aplications in app inventor and now i want to do an educational app for kids.

My idea is put some images and some possibles answers with buttons, but i want that all the options can show it randomly.

I want to put a seconds count too

Some ideas?

this might help 

A Multiple Choice Quiz: How to work with the advanced features

Thanks Taifun it helped me :)