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From what I have been reading and hearing on this sight. The easiest to breed are the livebearers. Guppies, Plates, Mollies.
Someone with more knowledge will let you know for sure. One thing they usually want to know is tank size. And water levels, ammonia, nitrite, and nitrate readings are good postings to have to help them get an idea of your tank and where you are at with it.
Joe, just remember - with livebearers such as mollies, platys, guppies, swords - the females should outnumber the males by at least 2-1. (2 females for every 1 male)The males will constantly chase the females giving them no chance to rest. Multiple females provides multiple distractions and allows the females to at least rest some.
Yes, you should get another female Sword and female Molly--even if the baby Molly is a female I wouldn't keep her because if she has fry they will be inbred. Also, tetras feel much more secure and happy if kept in shoals of 6 or more of their species. So, if your tank can hold them, please get 4 more Neons. You will see a lot more interesting behavior if you have more of them.