Welcome Kansas City !
Enjoy your research - your answer will come to you.
All of the possibilities you are considering have very different care.

IMO , and as long as the enclosure is built properly, the golden and the azureus ( in that order) will be an easy and rewarding first frog.
The goldens are a bold frog. Always visible. the orange morph is beautiful !
You might read about D leucomelas ?
This doesn't mean the others are terribly difficult ---- just very different husbandry.
If you study their day- to - day care....it might help you make a decision.
Read about 'the problems' people encounter with each species.
Read about the feeders you have to keep for them ! ie for the darts you will need to learn how to make fruit fly cultures ( of which is very easy )



PS- my opinion is ? bias ... I happen to love dart frogs. I still have 2 species of tree frogs (for many years) ... but like my darts much, much more.