Join a local fishing club - a lot of them have programs for junior members. I belong to MSBA up here in Mass and they do a great job with the kids. They will show you how, when and where to fish. Fishing people get a lot of pleasusre teaching kids to fish. Some of the local shops and craftsman donate rods and lures (Thank you Big Fish - I remember). All I can say is my four kids from 8 to 14 love it. The youngest (and the craziest) started when he was 4 and my daughter out fishes us all. Go to your local tackle shop, look around on line or go to a fishing show during the winter and you should be able to find a good club in your area. Main thing is to spend time with your children and to have fun - they will never forget. Good Luck!!!
