Unless you have medical issues, a simple standard multivitamin a day should be all you need. Drinking milk will also give you vitamin D, since milk is fortified with it.
Best bet: ask your doctor to refer you to a licensed nutritionist. Not someone who simply hangs up their shingle, but someone who works with the doctor if there are special needs. And if the nutritionist tries to sell you the supplements him/herself, run! Some supplements can put you in the hospital, and some vitamins can make you very sick if you take too much.
And yes, check if you should be taking a supplement without iron. Most men and older women don’t need it, and too much of it can also make you sick.