Sam here with the Shopify Guru Team. Thanks for reaching out!
You wouldn't need the Shopify name server - you just need to redirect your domain instead of transfering it.
If you are looking to point a domain you already own you need to complete the following:
- Your root domain (without the www) should have an A Record pointing to 22.214.171.124
- Your "www" subdomain should point using CNAME to your myshopify: tomjerry-model-store.myshopify.com
We do have more detailed instructions here: http://docs.shopify.com/manual/settings/domains/outside-provider
Hope this helps! We are available 24/7 via phone and chat too if you need more clarity.