Buy Quad?

Hello guys, for a couple of days I like the idea of my own quad, but I have some questions and concerns and I hope you can help me a little. I am 20 years young, have my car driver’s license (B) and I am in possession of a scooter. However, this scooter needs a general examination, as it always runs out etc. Now I’m not sure if I should put the money into an examination with subsequent reperature, or the thing tries to to sell the repair (or without it) because it caused me more trouble than joy. Therefore, the thought of a quad came to mind and I tried to inform myself as much as possible on the Internet. On the one hand, a B driver’s license is necessary, which I own. Well long speech short meaning ask to you the following questions: 1. is the appeal of a quad for a high school graduate with little money nevertheless justified? 2. Is that at all with the B class driver’s license or Are there any restrictions or other requirements that need to be met? 3. If a purchase is still interesting, are there cheap vehicles or which a high school graduate with a small side job can afford at all? 4. What does An sich speak for a purchase of a quad and what against it? General and specific in my case I hope that you give me a little insight into the world of quads and can open my eyes MfG