As soon as a prospect is added to an email list the pre-written emails are already queued up for the to go out.
So you don't have to turn them on :)
However it is important to process your contacts using the system by telling the system the outcome of your call for each contact. This will automatically recommend the best pre-written email list for this prospect to be moved to. When you complete an action with a contact it will automatically move them to the best possible list for that scenario and start sending them strategic emails based on the outcomes you select.