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help me choose vitamin supplements?

I'm 21, college student with overload school schedule, my bad eating habit is that I don't like veggie and milk. I'm considering some supplements but there are many kinds of them, I'm afraid that taking to many vitamins will harm my body.
for sure I will take:
Omega 3
Calcium, people said that it should come with Vit-D

the others I'm considering are:
multivitamins
balanced B
Vitamin A (working on computer a lot!)
potassium (my psy class taught me that we need K+ & Na+ for neurons 'firing' process, I don't like banana by the way)
melatonin 3mg (I'm high energy at night, trying to change my body clock, can naturally stay up until 6am if I don't want to sleep)
magnesium
zinc
Vit-C
Vit-E
folic acid with DHA
CoQ10

By the way, I'm currently moving from south to north, literally, from year round warm weather to a brutal winter place. Unfortunately, I have to take classes from a CC and my Uni which add up to 26 credits. Please give me advice on what supplements I should take that benefit me, keep myself physical and mentally healthy, especially for the cold days coming.
Thank you very much.