A/c assistant appointment letter t&c??

Hi guys,

I work in a small CA firm as an Accounting Assistant and need an appointment letter. I already have an appointment letter format however I am not sure what to put in the Terms & Conditions which describes things like salary, etc. in detail because I am only paid cash salary of Rs.5000/- and nothing else. I have gone through many formats but I am not sure what to include and what not as the T&C of the company. My CA firm is a small sole-proprietor firm of 5 people. Can someone help me what to write exactly? It is for immigration purposes.

Thanks so much.