Block all but exceptions

[Peter-Z]

Hi all,

I'm new to this forum & first time user of pfsense.
Currently I'm using a commercial package on windows, mainly as a router & content filter for a small office.
Since that program is outdated and I got a little familiar with linux, I searched for an alternative and bumped on this.

I have installed pfsense 2.0.2 as a virtual machine which works well as a router and browsing works fine.
This is what I like to be able to: block all sites, preferably with different rules for different users/lan ip's, and allow certain ones.
I had a look at dansguardian, squid & squidguard but it's not clear to me what is suited for my needs.
Can anyone please point me in the right direction?

TIA
P.