It would be helpful to know what you upgraded to; however, the RadioReference wiki has a great deal of information that could be used as a jumping off point.
http://wiki.radioreference.com/index.php/Main_PageAssuming you have either gotten a set of the new Uniden XT scanners, or the Radio Shack/GRE scanners, there are 2 FAQs linked on this page that will get you started - in the 'Popular Topics' section, click on the Uniden DMA FAQ or the GRE/RS Object Oriented Scanners FAQ
Note that anything in blue is a link, both here and on the wiki. If you need further information, please yell. This wiki is the largest one of it's kind in the world; likely as not if you come up with a question, chances are it's got something to address it. 73 (best regards) Mike