How Do You Craft the Perfect Appointment Letter for Diverse Staff Roles?

We need to issue an appointment/contract letter to the staff (i.e., for drivers, operators, security, cleaners). Please help me.

Temporary Appointment as Jr. Executive

CEL(B)/2011/14
Date: 26/11/11

Mr. Md. Ziaul Haque
C/O Jamal Badsha, 1st Floor,
B.K. Bari, Mirzapur, Gazipur

Subject: Temporary appointment as Jr. Executive.

Mr. Ziaul,
With reference to your application and subsequent interview with us, we are pleased to appoint you as Jr. Executive on a temporary basis for a fixed period of six (6) months, beginning from 1st December 2011 for our organization. This appointment can be extended further or terminated earlier with one month's notice on either side, without assigning any reason. Your monthly consolidated salary will be Tk 8,000.00 (Taka Eight Thousand only).

You will report to the A.G.M. (Production) Confidence XXXXXX Limited, Brahamonbagha, Mohjompur, Sonargaon, Narayanganj, on the 1st day of December 2011.

If the above terms and conditions are acceptable to you, please sign the duplicate copy of this letter, which will be considered as the acceptance of this offer.

Thank you,
For YYYYYYYYYYYYYYY,
(XXXXXXX)
Managing Director

A company is hiring one driver on a contract basis for one month without any allowance. Can you please help me with how to draft the letter? However, they need to take responsibility if anything happens to him or the vehicle.

Thanks,
Ain