Start sports betting so one can go on a class trip? That doesn't sound like it will go well.

Most people do sports betting for fun. They might think they will win money, but most people don't. Most people lose. But that's okay if they were entertained by it. Think of it as buying entertainment.

If you are serious about it then you need to do a lot of research. Even after that you will still lose a lot. It's a numbers game and even the best handicappers will still lose quite often and only have a thin edge that they need to manage bankroll properly and grow it over time (over many many bets).