Managing Drip Campaigns

Managing Drip Campaigns

I have established a drip campaign that follows up Leads with a series of emails. The leads are originated via my website and integrated with Zoho CRM. I have also established a link between these leads and a specific mailing list within campaigns.
However, it doesn't appear to be running the drip feed on a continuous basis - i.e. when a new lead is processed.
What do I need to do to set up such an automated process?