Which stretches can i do to stretch out my sciatica nerve in the morning?

Hamstring: The best stretching for this is your hamstring muscles (back of your legs) do this daily to reduce sciatica.

Core Exercises: Typically core strengthening exercises are the best to help relieve pressure and forces in the spine. I would try and google some or look them up on youtube to see descriptions. If you can do them yourself, wonderful otherwise ask your doctor to get a referral to a good physical therapist for further assistance.