Increase web presence for construction company

We are wishing to increase our exposure on the Internet regionally and nationally, with 3/4 focus on the regional effort. We are a general engineering construction company in the United States with a long history but have just began our Internet presence. Based in the Inland Empire of Southern California, our primary focus areas will range from San Diego County through Orange to LA County and include the Inland Empire itself. We require interested parties to be able to communicate effectively in English. Work must be clean and follow all general search engine requirements. Please send a PM with a detailed plan and include previous work experiences as examples of your capabilities. Since we do not sell products online, a method to track our ROI will also be desirable, include this in your plan.