Don’t try all the exotic practises in the initial 1 or 2 years. Initially it is recommended only to observe breath, and may be the 4/4/4/4 technique mentioned in another comment, you can try the 4/4/4/4 technique by inhaling through one nostril and exhaling from the other. And gradually increase the count from 4 to whatever you are comfortable with.
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Recent Yoga teachers, try to teach all types of Pranayama to a beginner, but when reading books written 100 years back, it is mentioned that mind and breath are linked tightly, and practising techniques which isn’t recommended for your condition, by an experienced guru, can actually make you mad.