That seems pretty good, you may want to get one more glo-fish though. But; here are some things you must have and know:
~You need a heater and a thermometer
~Read up on each and every type of fish's needs. There is no such thing as to much research.
~The Nitrogen Cycle! I can't stress how important it is! Please, read up on it!
~Only get either male, or female platys! They are livebearers, so if you get both genders then you may end up with some unexpected fry (babies). Which it may seem fun to have, until you have no place to put them and they start to get munched on by the other fish.