Confirmation Ceremony? sponsors?

In the catholic church conformation cantidates need a sponsor. during the ceremony the sponsor goes up with the cantidate when they get anointed. the bishop speaks and the response is 'amen' and then 'and also with you' i dont know if the sponsor says it too or just the cantidate? i really dont know what to do could some one walk me through what a sponsor does step by step for the hole ceremony