Do you put it into word and format the fonts like you expect to have them on your webpage?
Do you go straight for the HTML?
Write the text into a notepad file (focus on the copy) and then format as you create the HTML page?
Do you create the different components of a letter in seperate documents and then play with what way to order and then play with the order (depending on the strongest message)?
Or use a wordpress page and work on the WYSIWYG editor?