Based on my experience, even though I am under family visa, the contract stated everything about my salary package including yearly tickets and terms and conditions during my tenure in the company. In my opinion, you'll not have any other contract aside from the one that they are going to give you. However, during promotion (this is actually another issue) that will be the time that you're going to receive an additional papers stating your amended renumeration package.

Kindly note, I am not an HR staff so you better ask who's really in charged of this matter to give you an accurate feedback. You should keep in mind as well that the company here in Doha have different policies and procedures, in other words they are not uniformed when it comes to renumeration package.