Clean Up Website

I am looking for some help in cleaning up a website and making it more attractive and effective in drawing business. Also looking for some help with SEO once the appearance is improved. I can handle the content, but need help with the JOOMLA graphics and organization. I am familiar with basic HTML but JOOMLA (graphics and page organization) is a bit much for me. Once it were organized properly, I think I could manage it fine, but I need some help in getting it there. Would like to have a client intake function and a guestbook or similar function that I could use for newsletters, mailings in the future. Thanks, Brendan