If your site went live in the past 2-3 days, your site has probably not yet been indexed by Google. Sit tight, Google will find your site shortly. Once you are indexed, you will show up in the SERPs. If it has been MORE than 2-3 days and your site is not in Google at all, please contact your Project Manager or submit a support ticket because you may have a setting enabled that discourages indexing by search engines. You will want to reverse that immediately.
If your site is on Google, but your ranking is much lower than you initially anticipated, please read this article about page rank. If you have more questions about SEO and how ranking words, please contact your PM or submit a support ticket.