Yep, basically what Anders247 said (sometimes that's the best advice I can offer lol).
Cories need to be in schools of 6+ of their own species.
Cardinals need to be in schools of 6+.
1 honey gourami.
1 platy (they don't have to be in groups, but make sure you get a male unless you want fry).
Your user name is redwag, is that because you prefer platies? If yes then keep 3 or 4 of them as a single species tank. Your tank is 24 inches long x 12 inches wide. I like the 6 or more cardinals and only one gouramI stocking idea.
I agree with Et tu.
I think the question that you should ask would be along the lines of , How few of the following fish can I keep in a 15 gallon tank and have a nice display, as an under stocked (or properly stocked tank) is much easier on all parties' involved, rather than the often asked, How many can I keep in this tank.
Your tank will be lovely with fewer, but healthier fish, so err on the side of caution.
All the best to you, rick