Forum Moderators: not2easy
Rather than stripping out all of the FrontPage garbage code, and dumping tons of deprecated tags, and converting away from table design - it would probably be easier to do a complete redesign - even if replicating the look that you already have
Start with one page to get comfortable with using valid HTML and CSS, and then build your knowledge and skills. Markup a skeleton of the design (the key container boxes). Get that working crossbrowser. Then fill in sub-sections and test that everything still works. Then go a little deeper into CSS to style colors, border, padding text-decoration: - Break the project down into pieces, starting with the main outline and working your way to more and more detail.
One way to go. You may get numerous other suggestions.