Hello,
Dear as per HR policy of every organization which selects the candidate is being offered OFFER LETTER where everything is mentioned such as Salary, Job location , Job responsibilities,to whom you have to report , Leaves, code of conduct,Resignation procedure etc. and its candidate who accepts its. In your case you should demand for it so all above picture will be cleared ,if suppose company hesitates to give it then i will suggest you to look for another professional company.
Best of Luck....