Platies and Zebra Danios are good fish to begin with if you insist on cycling a tank with fish. You can mature a tank without fish, there are plenty of threads on 'fishless cycling' on here and elsewhere.
I notice you've started a hundred and one threads! Feel free to ansk as many questions as you like in one thread as people will still answer them. Infact they may get answered quicker.
I cycled my tank with 4 red wagtailed platys and would definitely reccomend them.
They are still all happily swimming around 1 month on and have been joined by 5 lemon tetras.
They are fun to watch and are very lively.
I just kept an eye on the water readings and did regular changes and they have been fine.
I also have live plants which they don't nibble which is a good thing, in fact they eat the algae off them!