paddy chappo 1

could anyone tell me how to train my lurcher to catch rabits? I ve jut recued a 2 year old male colliexgrayhound, i ve had him since this friday and im worried if i let him off he will leggg it and not come back. i want to work him and hes very quick off the mark. he seems to want to hunt anything that runs as he nearly got the cat yesterday. How manny miles do they need to be walked a day? Im walking him about 10 at the min is tha to much? I would welcome any advive