They will determine your reputation for service for years to come. If you do a great job, they will tell all their friends about you. Ordering online is still an unusual thing to do, so people who do it are proud of how adventurous they are. I just went to their Web site, found what I wanted, and gave them my credit card number. Three days later the stuff arrived.
People love to be able to tell such stories to their friends.
It's the most valuable kind of free advertising for you. So make sure that your customers have good stories to tell. If you do a bad job, your customers will also tell all their friends, and you will be in big trouble. Word spreads very quickly on the Internet. Especially this year, treat your Web customers as if each one were as important as ten customers.