I wouldn't suggest dwarf gouramis. They don't do well in new tanks, and they've been so overbred that the species is now susceptible to dwarf gourami disease, which is usually fatal. I lost 6 this way, and it really upset me because they're great fish with lots of personality.
I also wouldn't start out with neons, as they also don't do well in newly established tanks. Cardinals would be a bit better.
With any fish, start out with a full shoal of one species, then add another after a couple of weeks, etc.
Hope this helps.