Network Security upgrades

[chipppy]

I am a bit of a newbie to Linux in general and LMCE.  I have put in the order for a new computer to install LMCE onto and start playing with it.
I am going to attempt to set the system up as my connection to the www, and use it as a bit of a server for my other computer to access the www through.

What is the go with network (www) security.  Does LMCE have all the good apps to protect my system and the data stored on it or do I need to install other apps to protect my systems. 
If yes what apps would you recommend?

Cheers
chipppy