Your website is often the author of a customer's first impression of your startup - they're so important! The good news is that making an awesome website doesn't need to be as complicated and difficult as some make it out to be - Check out this blog post on 'Top Support Solutions for Windows Azure Web Sites', you'll find awesome resources and "how-to's" that are so easy to follow.
The IE team also has an amazing website to help you with interoperability, browser and cross-platform testing. Make sure to run your site through this free service and see if you need to make any changes.