The first thing to do is figure out with your physician why you might be iron deficient. In addition to iron supplementation through supplements and/or diet, you may need to consider additional testing to determine and treat the underlying cause.
Your doctor may ask you to take iron tablets, etc depending on the cause and degree of deficiency. Iron deficiency can usually be corrected by iron supplements and/ or changes to your diet.
They say that eating foods rich in Vitamin C (citrus fruits, green leafy vegetables) will help iron absorption while drinking milk or tea around meal times will hinder it.
If you searched Iron deficiency you should get more info plus a list of iron-rich foods.