You should never keep any Fish in a bowl. It's not suitable in so many ways. And since Goldfish are a type of Carp one of the many reasons it's unsiutable for them is because they will outgrow it by a fair bit. Before long you will need to find your Goldfish a pond to live in, or buy a very large indoor aquarium.
Now, don't think I'm being funny with you. I kept Goldfish as a kid in what I now think was probably a ten gallon tank. I had two Shubunkins, one Fantail and one Blackmoor living in there with a Weather Loach. We've all made mistakes here.
I sugest that you have a look round on here and have a good read up on Goldfish. There's a coldwater section on this forum Where lots of lovely people will be able to help you out.
And welcome to the fourm : )