A car lot dealer came to me today with a 50g tank sprayer for sale for $400.00. He knows that i have a small lawn and landscape business but didnt realize that i dont know much at all about fertilizing other than scotts granule bags. I know it is a great service to offer but have never really got into it. I need some help on gathering some information and guidelines on when to spray and what to spray. I want to start out with a basic program for about 10 to 15 customers maybe more depending on how many i can sale this service to but 10 -15 are certain. I also want to know where to buy materials such as soil testers, solutions, and all that comes along with spraying.