It may be the first time that you have had a website or run a business.
You will make mistakes and wrong choices, but don't despair remember every artist was once an amature.
And every master has a disaster!
At Onsitenow we use a really flexible content management system called MODX to build our websites. That means that we can add and remove features with relative ease, so if you make a wrong choice about a feature it's not going to be such a disaster after all. It can usually be changed and updated with ease.
Your website can learn with you as your business progresses.