To get your tank balanced, I would suggest started with the cheapest fish you can find. At the local pet store, you can get 10 feeder goldfish for $1. With about 20 of those, they will get your tank off to good start. Then, once it has cycled through for about a month with no loses, sell the goldfish back to the pet store and use it towards the ones you really want.
BTW: My favs are the Tiger Barbs.
BTW: My favs are the Tiger Barbs.