Click to buy sales page?

Site URL: https://newalchemycommunications.com

I am creating a sales page for a workshop. I'd like to just have one product on this page, with a "register now" button that would take customers to a checkout page - and then to a thank you page, and deliver an email sequence. 

So far on Squarespace, I've only found a way to create a "store" with a product - but now the prospect has to do 2 clicks instead of 1 - (arrive at the store, click on the one product, click on the register button).

If this is the only way to do this, would it be better to create a page with a "register" button that goes to a Kajabi checkout page? This is where the product will be delivered from. Thank you!