Hi

I'm single 25 years old girl from pakistan.My sister is in uk and living there for last 7 years.she is a doctor and earn a handsome amount.She want to sponsor me to live with her.. I have no source of income and my parents are not earning much too so I'm dependent on my sister financially.Please guide me which documents are required for dependent visa to go there.. Can my siter sponsor me?

If you are going as a student, she can sponsor student visa for you, but if you mean immigrant visa, maybe not. The term "dependent" means spouse and children, not brother/sister.