You need a parents help to make the super saturated sugar solution on the stove top. It makes a very syrupy solution. Then add food coloring . You will need some tall glasses and wooden skewers (if you don't have that use string tied to a popsicle stick over the top of the glass). It does take a few days to see the crystals start to appear.
The concentration of the sugar solution you made increases gradually as the water from the glass evaporates. As the sugar molecules are moving around in the solution they collide with other sugar molecules and stick together (that's why you started the stick with a dip in sugar). The longer the water evaporates the bigger your rock candy.