A 14-gallon is a little small for a community set-up with a bunch of different fish but you could probably pick 2 of those species 
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I would avoid mollies, they need more room and are picky about water parameters. Neon tetras would be OK size-wise but can be rather sensitive to water quality, especially if you have hard tap water.
If it was me, I'd go for a small group of platies plus a school of white cloud minnows or harlequin rasboras. All are adaptable fish doing well in a variety of conditions. They would also all do fine in cooler tropical temperatures (low to mid 70's), will eat commercial foods without fuss, and are peaceful.
I have to run but can post about them in more detail and answer questions later tonight.
.I would avoid mollies, they need more room and are picky about water parameters. Neon tetras would be OK size-wise but can be rather sensitive to water quality, especially if you have hard tap water.
If it was me, I'd go for a small group of platies plus a school of white cloud minnows or harlequin rasboras. All are adaptable fish doing well in a variety of conditions. They would also all do fine in cooler tropical temperatures (low to mid 70's), will eat commercial foods without fuss, and are peaceful.
I have to run but can post about them in more detail and answer questions later tonight
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