you just need to find something that works for each child being different ages.

With my 4.5 year old we have rules....no crying,no tantrums and to do as he is asked when asked and when daddy gets paid he gets a treat. if he does any of the follow he gets his xbox taken away for 20mins.

For my 2.5 year old its a simple stern warning and if he continues to do it he gets a car taken off him