there are lots of ways to get leads. you can buy large lists of leads, however you should be concerned about how these leads were generated. also, realize that while you may have leads, you may not have a relationship with these leads. if you need to import leads, you can use getresponse [30 day free trial] to import leads. also, be sure to track and test your traffic.
here is a thread on the warrior forum about this topic that you might find useful.