beginner please help

[gerbil_dude]

hi ive got a 24inch tank 15g and im completly stuck in what to put in it
gravel heater filter 7 plastic plants (all different sizes planted out)
2 rocks. freshwater tropical fish

what can i put in there?

[Blinky]

Please please post only in one place - it gets confusing for everyone else to see the same thing in three or four places, and you'll get a better response if you just post once.