SEO Keyword Audit and Error Fixing

We are urgently looking to hire an SEO expert to help fix 404 errors from the webmasters which we need actioned and resolved ASAP. Aside from this, we are looking to increase our SEO efforts across the site. It would be helpful to understand where our traffic is coming from geographically, and which links generate the most interest and page hits.

Previous experience with website SEO enhancement is essential for this project.