How to I attract customers from an old employer? -

I am looking for some ideas to attract old customers from an employer where I used to work. I was a karate instructor for him, but now I opened my own school. I left on bad terms and many people have already left to come to my school and I am sure many others would as well, but many are not aware I have my own school and I do not have any contact info for them. How can I target those specific customers?

You left on bad terms and you are wanting to steal his customers too? Your integrity in business is a very important part. You will get more loyal customers if you go about it the right way and leave his customers alone. If you choose to feed off of other business people s hard work(like all the advertising that they put money into) your business will not last long because your greed and lack of integrity will show up in other parts of your business too. And it ll turn people off.