How to take care of a 9- spinned stickleback that I fished from the pond?

I caught it and put it in a 1.5 gallon aquarium i am going to put it into a 10 gallon aquarium but i have to know how to take care of it and should i keep it with 3-4 inch goldfishes. (I am going to give them to a pet shop,)(and i also have one 2 inch molly and a 4 inch algae eater).