Attendance, Late Mark, Grace Period, Leave Deduction - Pl.Clarify

i am the new Hr in my company i wanted to know how to write the warning Letters or memo to the People who are coming late.
Please reply me immediately

Hi Sir
How to mail to all employee for same day information for leave will marks absent 2 days if not well so when join office will come along medical report.
Please Help

HI To All.
This is Subhash and i need a help from you all expert.
Please go through attached sheet and view the rules in 3rd sheet.
Based on 3rd sheet, 1st sheet will run and then based on 1st sheet with Micro 2ns sheet will give the correct figure of P,Leave, Short Leave and Half day.
Please help the same with.
Actual Time Grace 5 mints
Coming 7:30 After 7:36 to 7:50) Late Coming
After 7:51 to 8:00 Short Leave
8:01 to 9:00 Half Day

Going 17:30 Going @ 16:30 Short Leave
Going After 12:30 to 16:29 Half Day

Not Coming Leave

@Prithvi Pal Singh,
Thank you for sharing Late coming policy with us.
What is Pro rata salary would be deducted for such Leave Without Pay within the particular month under the heading of Deduction of Monthly salary.

Dear All,
I would like to inform you that , kindly updated attendance regularised , Half day and Leave in the portal. don’t wait reminder mail from the HR.
From this month on wards reminder mail will not sending from HR we are marking as a LOP ( Loss of Pay).
please help on this drafting, so i want to send mail to all the staff.
Thanks, regards,
shanthi fernandes

Hi,
The corrected one
"
Dear All
All employees are hereby advised to update your attendance and leave in the portal on regular basis. Please be informed that henceforth we will not send reminder emails in this connection. In case of non updation of leaves in the portal on time such leaves will be considered leave without pay.
All your co-operation is solicited.
Regards

What is the legal position, act or rule, specifying the penalties leviable on employee for coming late or being absent without leave.
We are a small co., with just 1 - 2 staff, and have no formal rules or policies framed.