Often businesses have a website created or updated but do not then promote it. If you have vans / signage or promotional material always remember to add your website to it. You could also make sure that you have set up accounts on the social media sits and push your new or revamped website on there. Be sure to mention what is available on there or what improvements you have made. If you have an ecommerce website, then you may be able to hand pick a few products that are either on special offer or are popular and promote the specific pages on your website where they can be found.
Google Adwords is a great way to get your website to the top of the first page of the search results page instantly – the day it goes live as otherwise you may have to wait a few weeks before it gets indexed by the search engines and even then it may appear a lot further on than you would like it to.