How big the tank size is hard to say. Some fish are more active than others and require more swimming room. It's also debatable. Some people say they can fit fish X into tank size Y while others argue that. Of course the fish will still be healthy in a smaller tank, but just keep in mind all fish would ideally prefer large amounts of swimming space similar to their natural habitat.
As for # of fish, it depends on a lot of factors, such as size/frequency of water changes, plant density, swimming space for each fish, fish preferences (schooling or solo?), fish waste amount (some fish are bigger eaters than others), filtration power/capacity, etc.
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