Looking to expand into Pentesting, then you should take a look at;

Now this is not for noobs, its hardcore – but hey that is what you need working in this field.

Another link would be Backtrack (a linux boot cd with all the stuff you need);

Caution Note,if starting out in this field, be sure to NOT try pentesting random sites/networks, you may do it only for fun and to learn, but it may be illegal (depending on regional law, and on what tests you perform) furthermore the sysadmin on the other end may not enjoy your ‘school project’ and take it very serious.