Here are the documents that need to apply online Passport.
1) Aadhaar Card.
2) Voter ID.
3) 10th certificate.
4) PAN card (Optional).
5) Email id
All these are used for fill the forms.. like you know “Aadhaar” card number is necessary everywhere. Voter id or Aadhaar will use to fill the correct address and 10the certification will use to fill the correct Name of your and your parents. This is also use for D-O-B. Email id will use in first step of form and for login time too when you submitted the form.
So here is the procedure..
To Apply online for Fresh Passport visit to User Registration page and fill the required fields. First of all it asked for Name, email , DOB etc.. like this
After fill all the required fields click on Register button and this will send an email to your register email id. Open your email and click on the link it will redirect you next form of the site.
Its a Multiple page form so you have to fill the field as per form description.
After completed/Save the form .. you have to book the appointment for confirmation of the submitted form at Passport office.
Here is the Procedure to Book an Appointment.