More research is definitely better. The time to do research is before you get a pet, not after! I considered fire belly toads as well, but apparently they are mostly wild caught. I prefer captive bred. Also, I strongly suggest understanding aquarium water chemistry if you plan on keeping an aquatic or semi-aquatic species. It will be much harder to keep them in good health if you don't know how to handle water quality issues. It is fairly simple, really - it boils down to yes, you need a filter, yes, you need to clean out poop, and yes, you need to do water changes. Once you wrap your head around that, fish tanks are incredibly easy compared to amphibians. After all, most fish will happily eat flakes or pellets that you can buy and stick on the shelf, so the hardest thing about feeding is not overdoing it.

I don't think you should count out pacmans just because you don't want to raise feeder rodents. They do very well on earthworms, roaches, and other invertebrates. If you still think they should have an occasional mouse for the calcium, you can purchase frozen ones as an occasional treat. Some will also take commercial food readily (mine prefers the dough balls to live food, but s/he gets a rotating variety because I'm a little insane when it comes to nutrition).