Starting a community tank; is this a good combination?

I know about establishing the tank, letting it run and about the nitrogen cycles and ammonia. However, I'm starting a 20 gallon tank and I want to know if anyone knows if these fish will get along... If I got 3 Neon Tetra's, 2 Dalmation Molly's, and 3 Guppy's, would they live well together? And if so, could I throw an African Dwarf Frog in there in a few months? Just wondering... Never mixed fish species before lol.