For a tropical tank you need:
-gravel
-some sort of tank. i recommend 10 u.s gallon and up
-filter. i recommend off-the back kind
-heater
-aquatic thermometer
-either plastic, silk or live plants
-nitrite, nitrate, PH, ammonia test kit.
-a bottle of pure ammonia to start off the cycling
-water dechlorinator
Read the pinned topics. They'll help you alot. Please read the fishless cycling one carefully. you cannot add fish until this cycle is over.
HTH,
Skylar