Oscommerce Website Optimization Reduce Mysql Queries Page Caching

Currently only parts of our site [login to view URL] is cached. We need all of the site to be cached that is not https and the checkout does not need to be optimized because a new one is under development. All sections of the site that display products or articles need to be cached. We have an existing cache system in place designed by chemo which can be found on [login to view URL] but it is a few years old now. The main overall goal is to reduce current mysql queries by at least half. This project would be considered complete when I can see either 50% + reduce in query load or entire site as described above is cached optimally. Please do not bid unless you have at least 5 years experience.