Auto parts reseller website SEO

We are an ecommerce website that resells auto parts and accessories and related hardware. We are looking to drive more traffic directly to our website. We have several Adwords campaigns currently running but want to increase our presence through organic search and SEO. We are interested in only acceptable white-hat methods to increase traffic. We have a solid reputation in the industry and do not want that or the site compromised or black-listed. Only qualified experienced companies will be considered. A detailed sustainable plan is what we're after. If you have any questions or need more information please let me know.