A great confusion on employee agreement

consult nearest lawyer on all options.

first welcome note with his name followed by and his designation to the family of the organisation and his pay packet and his date of joining with his department and the de

1. welcome note

2. name, designation, department , reporting head manager 

3. pay packet with total and take home salary

4. date of joining

and in agreement on 100/- stamp paper as per legal format he has to use 

1. paper details of both the employee and employer with his appointment details

2. terms and conditions as per your company policy  

Thanks a lot K. mahesh and please clarify the following points:

1) Is appointment letter (on plain paper) without any agreement is legally valid ? 

2) Should a plain paper agreement needs to be stamped before submitting in court as evidence ??

3) Is it compulsary to use Rs. 100 stamp paper in agreement ???

4) Why is it necessary to make two different documents (i.e. Appointment letter & Agreement) ????