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Guppys need a heater and filter
I don't recommend mollies because they are brackish (need a certain amount of salt) and they can get aggressive. They also can grow to 4-6 inches in some cases which is not that great in a ten gallon. Danios I believe need heat and filter but I have never owned them. I do know they are small. so again, I wouldn't do the mollies. On the filter, I use the cheap ones for ten gallons you get at walmart and they work fine for me.

From what I know (anybody correct me if I am wrong)

Guppys need at least three with a two female one male ratio
mollies need the same ratio
and danios do best in groups of six
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