I have rules in development and apply them on this small project which I designed and build.
1. Good text editor (sublime) with emmet (zen codding). I wrote al markup in one command, insert in file
2. Using popular methodology. I used smaccs, have never before use it, just BEM — it’s not popular in your country.
3. Progressive design strategy. It some some different picture in new and old browsers. (support ie7+)
4. Responsive design
5. SASS. (own mixins named a-*) Very like it, used loops, condition, etc.
6. Sprites, font-face for icons, base64
7. Writing scripts in jquery namespace. (jQuery.fn.extend)