No form is required to submit while enrolling ESIC, as everything is online now. You can circulate a format to new employees to fill the dependent details, date of birth, address, bank account, IFSC, aadhaar no, etc to update it in the esic portal.
Once an employee left, You have to mention the reason for zero working days while filing the monthly returns in portal as left / retirement. So the same name will not appear from next month onwards. No paper work is required in ESIC