Step 1: Holding the violin
Here's a starting position:
Stand facing straight ahead, arms down by sides, violin in left hand, bow in right, feet slightly apart. Relax (take three deep breaths. Hunch your shoulders and drop them - repeat three times).

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http://www.thestringzone.co.uk/accessories-violin-shoulder-rests-viva-la-musica-by-augustin-viva-la-musica-original-violin-shoulder-rest
But you should find something that works for you.
I disagree with your teacher: if you twist your neck round to the left (so your nose is pointing at the strings), tension is unavoidable. I think you should be facing forward. But there are as many opinions as there are teachers!
What additional tags would you suggest?