Site URL? Main Keywords? Without knowing the specifics, the best we can do is point you to basic intro SEO articles and guides. Which reminds me.. check out the SEO Starter Guide by Google.
focus on Geo-targetting (i.e location + target keywords). Register your site to Google business listing.Work hard on building links and always keep your site contents updated.
First of all research some keywords for your website with good search count.. After this, the main work is to optimize your ON page i.e meta tags.. put good title and description targeting keywords for your meta tags. Now start your OFF page, here there are lot of practices to do like bookmark submissions, classified submissions, Blog content and submission on different blog directories, Article content and submission on different article directories, directory submissions, document sharing and many more... All these practices will surely help you to make you web page optimize with good PR and top Google ranking.
Firstly you should start with On-Page, for this you need to research some keywords related to your site and use it in your title meta and after this start Off-Page practices like social bookmarking, article marketing, blog posting & commenting, classifieds, directory submission. Apart this you should start making your presence on social media sites like facebook, twiiter. These all practices will surely help to make webpages on the top of the search results.
Build back link with using anchor text your targated keywords. write Article and submit them to article direcgory and point your website link