If you look at your hosting account, you sould beable to find the php stuff... there are pre-built functions/classes for things such as stats etc.
You can use those for most tings such as referer tracking etc.

The other thing to consider is creating a sessionid and a table for tracking users...
You can then save the referer (where they come from), their browser, OS, the page they arrive on and the subsequent pages etc.).

This will give you what you need to know for individual Users, Page Impressions, Who goes where, the most popular sections etc.