[HELP] Script Enabling/Variables

[himynamebob1]

Is there a way to make it so you can not use a script until something else happens so lets say, someone wants to cook something over a fire, well there has to be a check made that the fire is on before the item can be cooked. I also need help with the fact that a player can not put down a jar to pick up drops of something until they stab into the something and have it leak out.