To Convert One HTML Page To CSS

Ok, I dont know if this is possible as I am only familiar with HTML and do not know enough about CSS. I have an HTML template with Javascript in it that I use for my listings on ebay. I want this tepmlate to be coverted to CSS so I can have several .css files containing various parts of the HTML, like TITLE, ITEM-DESCRIPTION, PHOTOS, PAYMENT-TERMS, POSTAGE-TERMS Etc. This is so I can ammend any part of the Description or photos or terms in the .css file which will automatically show up in the listing. In basic terms, if I change one of my photos in photobucket, as long as I keep the same image name, it will change in all the listings with that photo in it. I hope this isnt too confusing. Oh and I need to know where I can host the .CSS sheets externally. Copy of template has been uploaded. There must be no restrictions on the use of this CSS, I need to be sole owner. Budget is tight at present but I dont think it is too hard work for someone who does this stuff all the time.