Could I have info about prevention of lymphedema in my arm?

Not really possible. Lymphedema occurs when there is a compromise of the lymphatic circulation. This third circulation (arteries, veins) carries things too thick to be safely carried in arteries and veins like bacteria eaten by white cells and digested food. It is propelled along by normal body movements but contains a thick material called lymph. Blockage causes it to back up causing soft tissues/skin deformity.