Best setup for domain CNAME pointing Shopify custom domain with email hosting via InMotion Hosting?

I have a primary domain and a secondary domain, and I would like to forward/redirect the primary domain to the secondary domain which is for a shop I will have on Shopify. The domain names are currently registered on Namecheap and I have InMotion Hosting for hosting space I use for some other work I do, which can also host this site and/or domains. How do I configure the following:

mywebsite.com (CNAME) → mywebsitestore.com (Shopify store)

…and then configure emails to go to either or both of my custom domains: john@mywebsite.com or jane@mywebsiteshop.com)

Can someone provide some pointers if you have experience? Thanks in advance.

Use Google Workspace. Once you’ve verified ownership of the domains, you can setup mywebsite.com as an alias domain such that any email addresss you have on mywebsitestore.com, are replicated as mywebsite.com. All without having multiple email accounts.

For example, you have one email support@mywebsitestore.com. Any email to support@mywebsite.com would be received on the account support@mywebsitestore.com. More info in their docs https://support.google.com/a/answer/7502379