converting to drupal module help required

Hi all,
I have some split testing script, which works fine for my website. The drupal has AB split module but it works for two different themes, while my requirement is that it should work for individual pages instead of themes. also the ab test module of drupal allows only two themes while my script has no limit. Now my problem is that i have studied one or two module tutorials but still i could not pick how would i convert my script into drupal so that it would interact with drupal in a normal fashion. also since it will be for individual pages, it should be a node module??? please help me in this tutorial. suggest some comprehensive tutorials so that i could convert my script into drupal modules. I could even keep it as an open module on drupal if it works. all suggestions will be welcomed.

Thanks