Track Surfing Activities Using a Log File

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Hello,
I'd like to track the surfing activities of people who visit my website. I'd like to start tracking their activities the moment they log in. I have a login page in which they need to enter their username & password. Once they have logged in, they will be able to use the various features on my website which are behind the login page(password protected & have sessions).The people may browse from page to page & I'd like to capture all their activities on every page.

I have created a table in my MySql database with fields like date, time, id(a unique autonumber that identifies a person), etc. This table is supposed to capture all the surfing activities of the people.

Apart from that, I don't know where to start & what else to do.

Could you advice me what to do. I'm a newbie who does not understand much technical jargon.

Thanks.