If you want new customers then
Here is a basic rundown of the practices that make up
SITEMAPS & SEARCH ENGINE SUBMISSION
A Sitemap is a page that helps the search engines navigate themselves through your website. The better the engines navigate your site the more trusted you come across. A site map should be submitted to the key search engines.
META TITLES & DESCRIPTIONS
The Meta Titles & Descriptions tell the engines exactly what a page is about, which of course helps to fit your site with the relevant keyword searches. When you search a keyword, the search results you see include a Meta Title and a Meta Description. This is obviously important for the engines, bit is also super important because it is often the first contact you have with a potential client or customer.
Building third-party links to your website works in two ways, not only does it increase direct inbound traffic to your website but the search engines see this as an indication of credibility and rank you higher. Third-party links include listings in business directories, etc.
The performance of your website is going to play a big part in how well a browser can navigate your site and if it performs badly then the search engines will penalise you. So your site should navigate well and fast.
Have you ever clicked on a website link and you get a page saying ‘Page not Found’ or something like that? Well if you have links like that, then you’re going to be penalised again. So Google Webmaster Tools should be monitored for Crawl Errors and 301 Redirects to other pages should be implemented to correct any such errors.
REDUCING DUPLICATE CONTENT
Duplicate content became a huge issue only recently. The key search engines will now penalise you for having duplicate content on different pages, so make sure your content is unique from page to page.