Website Migration Advice Needed

So i want to move my website from a self-hosted platform like shopify to a woo-commerce store.

Whats the best way to do it?

Do i build my new site offline on local host first?

whats best we to 301 urls to the new url structure?

what advice and tips can you give me / how would you do it?

Thank you to anyone who can advise me, im been searching YouTube for advice but i can't really find what im looking for.

Well, I assume there are tools for this migration. (I'm not familiar that much with shopify)
But if you want to move to woocommerce, maybe building the website in wordpress with woocommerce is the best option.
You can build on local and when you're ready, import it live.