Today my doctor told me that a surgery must be done to my hand due to ra . would my hand be better and function is there any side effect?

Hard to say: The treatment and risk will vary largely based on symptoms and the type of surgery that is recommend. If you are at all apprehensive I would suggest having a second opinion from a surgeon or a rheumatologist.

Depends: Dependes on what surgery is planned. Could be simple carpal tunnel surgery to overcome the pressure from synovitis to correct deformities at the metacarpal-phalangeal joint. Discuss the anticipated procedure with your hand surgeon and he/she will answer your concerns

Get a second opinion: You are very young for surgery. Usually disease modifying agents are used early on.Surgery is an option but a second opinion is appropriate.In early phases of the disease, an arthroscopic or open synovectomy may be performed. It consists of the removal of the inflamed synovia and prevents a quick destruction of the affected joints.You should see a rheumatologist who can help guide you through this