HOW to SEO + Redirects to migration from URL to my own domain

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I have been running my company in a hybrid structure, with wordpress (Articles, Blogs, etc..) using my own DOMAIN, and my Ecommerce is on Shopify, using subdomain I intend to merge everything and ONLY use shopify.

This means there are 2 migration processes:
1. from Wordpress to Shopify (Home Page, Blogs Posts, etc...)
2. from OLD shopify url to new one (Ecommerce remains on the same account BUT links change due to use of my own domain)

So, my question is, what is the best approach to those two, without losing SEO, and setting up REDIRECTS so that old links dont get lost?