I am 5'8", 57 kg, i want to put on weight. what should i do? please provide detailed info and diet plan if possible.

A health diet will: Help keep you healthy. One good book about overall health is david katz's disease proof http://www.Amazon.Com/gp/product/1594631247/ref=oh_details_o03_s00_i01?Ie=utf8;psc=1 one needs to turn fat into muscle which requires protein, fat, and carbs, and exercise. Many are too high on carbs. Like yourself now; don't wait until your are the mythical perfect weight/height. Peace and good health.