Forever Green Professional Lawn Care
If your family is relying on you for all the income, keep your current job and work in the lawn industry on the side at first. 50-75 lawns is possible but very far fetched. Also unless you have benefits from your old job after you leave your going to pay out the ass for insurance (medical). Big businesses do not grow that big in one season or even two.
19 Years Old
Doesn't matter what kind of equipment you run as long as you get the job done correctly and up to par.