Along rivers and streams is a good place to start also farms and allotments. As for starting the terrier either get somebody with a working one to go out with you or let it hunt them itself, the dog will mouth the first rat it finds and get a bite, then the terrier instinct will kick in and shake it. For shifting them either make a smoker out of a strimmer engine or buy one, If you were closer I'd of took you out a few times for the rats