I am not that familiar with the making of
nutrients, yet. I am also learning. I have read of some people doing well with the advice from a person named Daniel. Here is a link to his website below. He has made a
nutrient calculator and his site has some instructions to help. I have a feeling he may be of the most help to you. If I remember right, finding commercial nutrients in the UAE is not easy and shipping costs way more than the nutrients, so you might be best off sticking with making your own. I wish you well!
Everything About Hydroponics: The First Free Hydroponic Nutrient Calculator Program 
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