How is an offer letter make of

We would like to inform you that below are the steps to write an offer letter:

Date
Subject: job offer
From:  ____________( the sender)
To: __________(the recipient)

Greetings: 
We are pleased to present this job offer to you as follows:
Basic information and data of the person nominated to work (degree, job title)
Information related to the position applied for, including the following: Salary items. allowances. vacations. The medical treatment. Social Security. Duration of on-the-job training, if any.