Best practice to re-write a tutorial website

Dears, I am planing to rewrite my website. My site is tutorial-type site I wrote it, when I first learned php3, as an undergraduate research class. I think the code is sloppy as it is mixed with the HTML. I would like to rewrite the site utilizing the good things such OOP classes, template, etc. I would also like to separate my styles (CSS) from the HTML. I would like to have the following functions: 1. Printer Friendly Version Capability 2. Search-ability 3. Search Engine Friendly Therefore, I have the following questions: 1. What is the best way to store the tutorials. Should they be in a database or each in a separate HTML file. 2. How to implement the above three points? I know it is a broad question but you can help me on whatever you know? Thank you in advance.