Does it have to be TrueCrypt?  If not, the wiki details through the steps to encrypt the home partition.  http://www.linuxcoin.co.uk/wiki/index.php/Encryption

This is a Debian based OS.  When I get stuck, I often search blogs, manual pages, official distribution documentation, and forums of either Debian, Ubuntu, or Linux Mint.  All of those distros are Debian based (In other words, they are inter-operable for the most part.) and thoroughly documented.

If you're set on installing the TrueCrypt package, you could try to follow this guide http://ubuntuforums.org/showthread.php?t=149561

There's no officially supported Debian package for TrueCrypt.  Someone correct me if I'm wrong on this, please.  I think this is due to licensing issues.  If there was a supported package, it would be really easy to install through Synaptic Package Manager or Apt.