Well, I have retired from my fulltime job at the end of this year. In the Spring, I would like to start a lawn service. Not big, maybe 15 lawns or less. I will of course look over the do's and don'ts that are already listed here. I will most like work alone or maybe hire a helper. If I wanted to get certified in NJ for fertilizers and lawn treatments, how would I go about it? This would be something that I would do after I was establised for awhile, but would like to know in advance what I will need. I have 20 years experience with gardening and lawncare at my home which is appox 20,000 sqft of lawncare. I am also fimiliar with irrigation systems, their repair and service. Suggestions please...?