A fatal decision you can make as a website creator is to plan your website down to the smallest detail.
You cannot plan a tree. You can only plan to plant it in a favorable place. You can't plan how to swim, but you can plan to learn how to swim in a body of water where there are no three-meter-high waves and bad-tempered sharks.
A website accompanies you on the journey of your company's lifetime. You can plan its structure to allow for growth and you can plan the technology to allow for expansion.
But then you should get started. Because the experience you gain through mistakes and feedback is more valuable than a lengthy and usually frustrating planning phase that aims to be "perfect".
Have the courage to simply get started with your ideas.