Sorry to hear you've having issues! We're here to help.
Are leads coming into the system? If so, move on to step #2.
If not, often the culprit is an improperly setup Zap/Funnel. Please make sure that the information the app is getting is what you want to send :)
Are you testing outside of normal business hours? It's possible that you may be testing, or seeing prospects come in outside of the cutoff times. In this case, the prospect begins the sequence the next morning.
The settings for the cutoff times can be found inside the campaign Settings.
Please ensure that the location, cutoff times are where you want them - as well as whether or not to send on weekends.