Though yours is small question, the reply is too big. You need to take proper training on this subject. There are numerous government rules with respect to Tax Deduction at Source (TDS) at the time of disbursement of salary. Further government keeps on making changes from time to time. You need to update yourself on this.
You may approach Satvam Consulting, Mumbai. They organise training on this subject. Click the following link to refer their training calendar:
Satvam Consulting Private Limited - Training Calender