The fun jump rental business can be as much fun, and as profitable as you want to grow it and make it! For most fun jump rental service businesses, the items needed would include inflatables for jumping and bouncing.
Some with slides, that go easily up and down, with portable air blowers to keep them inflated.
Kid's parties would probably be your biggest customer base.
You would want to have a nice flier made up that you can pass out at all parties.
You should include some nice signs on your car.
You should pass out fliers at birthday parties, kid's day care centers.
You can post fliers at parks and playgrounds, and just about anywhere you can get a good response from parents.
You can target grand openings, childrens stores, pumpkin and Christmas tree parking lot sales, schools, day care centers and other places.
You might want to mail a flier to would be party planners, catering services, clown services, anyone that also interacts with kids, and parties are a prime spot for you to pass out some of your fliers, because they might know somebody, who knows somebody, and your business will grow.
You could have others out there someday, placing your fun jump rentals for you while you collect the money and profit! You should take advantage of free websites that let you list your service for free, the key is to get your business in front of as many people as you can, and keep the cost virtually free or low cost!