There is a sticky note at the top of this forum that has all the most important links you will need, start by going through those links and then start by reading up on those tools that you have i.e Cain & Abel has a very nice Help file that explains how to use each function of the program and also explain those functions. You can get the latest version at http://www.oxid.it
(website is in the sticky note). Read up on cryptanalysis and brute force attacks, along with DoS attacks here is a link to guide through all that http://www.go4expert.com/search.php?searchid=124493
find some articles I wrote and read them. Then you will need to get a linux partition on your hard drive to make some things in life just a bit easier. Tell me if you need more.