Each student will need to have a selection of French breakfast items - croissants/petits pains au chocolat (sometimes known as chocolatines)/brioche (rolls or slices), baguette with butter and jam or Nutella. They will also need a knife. Mini croissants/petits pains au chocolat, if available, might be better, as they would allow the student to try more than one type of French breakfast pastry. 
Hot chocolate is the most common drink for children, though milk is fine (children in France wouldn't usually drink coffee). They usually drink from 'un bol' (see the class photo), but a cup or mug is also acceptable. Parents are the best judge of if their child can safely prepare  the hot drink for their child - just be aware that a 'bol' can get hot. French children usually have a fabric serviette handy.
I will provide a one page handout with the vocabulary used in class at the end of the lesson. I find students pronounce the words more accurately when they have not seen the words written down before the lesson.