Reading you're post, you're quit new to poison dart frogs.
You might consider to start off with some forgiving species, more tolerant to mistakes every novice is guaranteed to make

Epipedobates tolerates a wide range of temperatures and is quit the bold frog, an underestimated little guy with a hell of a voice.
When it comes to getting experience in breeding, this might be one of the best species.
Whether you choose to manually hatch the eggs and raise the tadpoles, or you leave it up to nature, they will reproduce for you

If you like, Dendrobates leucomelas do great in a couple or trio (2.1) as well and can also tolerate quit a bit.
Phyllobates bicolor are great as well and has a nice vocal, when you provide enough room, you can keep them in a male heavy group for best result.
Altough i hear stories from people finding the bicolor not as easy as i found them to be.

Tinctorius look bold, but in my opinion not directly suited for a novice on Dendrobatidae.

Whatever species it is you are going for.
Like Jim0 already said, orientate, read, ask and whatever it is you do first; to learn all about the needs and requirement of the species you are going to keep.
Make sure everything is right, from insurance of enough life food to the decoration and values in you're tank.
This way you will have a much better first experience with this wonderfull frog family