wiifitmama i think once of the first meals ds1 did was jacket potatoes, nice and easy, just poke with a fork, put on a bit of olive oil and stick in the oven and then prepare toppings like tuna, cheese etc.
making sandwiches, pizzas etc also very easy and good places to start and then stuff like spag bog, chilli, shepards pie, ds1 can do all these nad loves to cook. oh puddings they always like making puddings, ds1 makes a mean cheesecake 
my children, well the elder 3, hoover, change bedsheets, tidy their rooms, help with laundry, putting it in the maching, hanging/folding it, sweeping the floor, clearing and wiping the table etc they dont do it all and they dont do it everyday but they do do all these things regularly. i dont think its slavery i think its REAL life they see how a household has to be run and as they are part of the household they help out! quite simple :)
and a kettle can be dangerous but if its not over filled and they are careful and sensible (which a 12yr old should be) they are more than capable of making a cup of tea!