There are many tricks to designing your pages so that search engine robots can find you. Put your URL on anything that you print or otherwise send to your existing customers. Advertise on the Web. You can purchase banner space on other sites in your industry or on information sites. Make sure your site is well maintained.
Dated material is an eye soar on the net.
Who will pick up your E-mail. Consider breaking this up into the departmental users but have an overall manager. Remember, many of the users believe there is someone right behind the site. You will sort of advertise, don't call me on my 800 number, send me an E-mail.