Custom Blog (REVISED)

I have a blog through Yahoo that I cannot customize to the degree I would like to. I also cannot backdate entries. I need someone to help me create the inner workings of a new custom blog so that I can customize the final appearance 100%. I have a website posted at [login to view URL] so you can see what the website/blog look like now. I am revamping my website for my wedding and want to have a wedding blog, so I need this to be done as quickly as possible. My main wishes are to be able backdate entries, customize the appearance to blend seamlessly with the rest of my website, and receive comments from guests. ***UPDATE. I posted a pure html blog just now. I do not want a template. I want a blog that looks and feels like what is posted now but has the additional ability for guests to leave comments on entries. I may also be interested in a guestbook if you are able to do that as well.