A realistic sequence.
WEEKS ONE TO TWO
Choose and register the domain, in the business name Set up hosting Create business email addresses and configure them on your phone Enable auto-renewal on both
WEEKS THREE TO FOUR
Write your content: what you do, for whom, prices, contact
Take photographs of your work or products Build five pages
WEEKS FIVE TO SIX
Set up your payment gateway and complete verification Test a real transaction and refund it Configure delivery zones and rates
WEEKS SEVEN TO EIGHT
Create and complete your business profile Set up backups, stored off the server Run AutoSSL and check the site on a phone
WEEKS NINE TO TEN
Tell everyone who already knows you Take your first orders Fix what those customers struggled with
WEEKS ELEVEN TO TWELVE
Ask every customer for a review
Review what actually happened: costs, delivery, enquiries
Fix the biggest problem
THEN
Add content monthly, and improve rather than expand.