In New York City, you need a bachelor's degree and no criminal history. Apply through the DOE website (schools.nyc.gov) starting in March; eligible candidates will be called in for an interview and writing test. Those who pass are added to the roster of substitutes to receive calls about gigs. Some are listed in advance, but most pop up either late the night before or around 5 or 6am the morning of. You can teach up to 40 days a year for $154.97 per day.
There are several ways to make money from your car such as taxiing people, renting your car, or advertising businesses. Run the numbers before using your car to make money, especially if you're driving more than usual because it might cost more than you earn to use your car as a money-maker. Factor in depreciation, wear and tear, and gas expenses when you decide if driving is a cost-effective way to make extra money.