This isn't perfect, good stuff!!

I wouldn't put fish in, the volume of water isn't enough, the toxins from the toads will probably be concentrated.

Some great plants for land and in water are pothos or cyperus plant. Elodea, duckweed and Amazon frogbit in the water. I think you'd probably have to increase the light, though. I would just keep it artificial just now to save the hassle.

Pet shops usually have **** advice and barely keep their animals long term enough to their care.