May I know how can I design a website like this?

Hi everyone, may I know how can I design a website like this? For WordPress

Which plugins or themes to use for a WordPress site?

I need a front intro page (let's say domain A) and then have clickable links into the main ecommerce site (which is also using the same domain A)

Thanks

Use https://builtwith.com to find out

very easy
design a static html page as your index file

Code:

your-server/public_html/index.html

somewhere in there you need to have a line that says <a href="yoursite.com/store">Proceed to Store</a>

now make a new directory and install WP inside of it

now go to yoursite.com/store and finish configuring WP