It can be pretty challenging to mess this one up, but we've seen it done before. If your website is built on a platform such as wordpress, your site is almost certainly already crawlable. Go ahead and pat yourself on the back.
However, if your site was built from scratch, you definitely want to make sure that search engines are including all of your site's pages in search results. If you haven't linked your website up with Google Webmaster tools, you'll to do that now to assist Google in crawling your website. Then, check out this page for details on how to make sure Google is successful in crawling your site.