The first thing to think about is ' is your child ready?'. If the answer to this is yes then take your child shopping for big boy/girl pants and a potty, personally I would recommend the chair potty, although a little more expensive they serve better as your child gets older.
Incourage your child to use the potty before they go to bed and first thing when they get up. Try no to use training pants, although they are great for parents as clothes don't get wet, the child doesn't have the same wet sensation as they would with a pair of pants. However saying that, if your child is having accidents and you are fed up of wet clothes try putting a pair of pants inside the pull ups, they then feel wet, but you don't have wet trousers to worry about.
Don't push your child, they will train when they are ready, believe it or not!