Shopify Store Audit and Fix to Launch

I'm in the early stages of building a Shopify store (see link here: https://lovecoffeeandcats.com/) and need assistance with back-end configuration. Ideally, I'd like to partner with a Shopify expert who has in-depth knowledge of these settings and can guide me through the process.

Specifically, I require assistance in the following areas:

Understanding and configuring settings related to delivery dates and order processing, ensuring accurate delivery estimates for customers.
Navigating the complexities of taxes and duties, gift cards, and market-specific considerations.
Identifying and suggesting missing information crucial for a well-rounded store experience.
Implementing specific languages and currencies to cater to a wider audience.

If you possess the expertise to address these needs, please share your experience level, proposed approach for this project, estimated timeline, and cost range.
Thanks in advance!
Angel