Hi Tulasi,
From employer initially you required only Offer Letter after which you will receive the Appointment order along with other relevant salary breakup's and your benefits details...
You have to produce all your educational certificates photocopies if required they will do the verification of your originals. previous employer pay slips, relieving order, experience letter and other Xtra curricular certificates like sports and other competitions.
above are the basic requirements; but subject to change as per employer...
thanks
shivam