It sounds like you're reading everything you can on these guys (both great beginner species) and off to a good start. Most vendor/sponsor websites have Care Sheets you can access, as well, for general information. My best advice is to watch your food supply. The number one mistake I see is people running out of cultures (whether they crash or get mites or whatnot) and finding themselves in a pinch. As for the fish, dart frogs drown (and sometimes try to drown one another) fairly easily, so I'd say keep the water shallow or inaccessible. At least for now, until you're a little more experienced. That said, a water feature is very feasible. Good luck and enjoy!