How to schedule task, Meeting, Calls in leads:
From the Leads list click on Name and you can view details of Leads like below
you can add Notes for that Lead and send an email to customer.
New Task - To create Tasks for that Lead
New Meeting - Scheduled a meeting for respective Lead
New Call - Schedule a call for lead
For Task and Meeting you can change the Status as pending, Completed also you can add these Task and Meeting in your To-Do at the time of creation only.