You need more of them, BUT don't add anything else now. They're a schooling fish. Neons and these will get along fine..
[edit] if you want to get rid of them, do what Alan said [/edit]
Take them back if they're not want you want. And, if the salesperson actually said those were bronze corys, he should be sacked. But, you should really of looked up Bronze Cories before you tried to get them.
How do you know your tank is cycled? You've only had it setup one week ... Angels are too big for your tank IMO. I'd stick to community tetras / cories.
Guppies are rabbits of the aquarium. They'll breed everywhere.
I have bred guppies in a community tank. If you want to keep high numbers then either get another tank, or buy a guppy breeder.