I second the thread... lolololol!
Java moss is ok, are you thinking of letting it float freely or attach to something?
Really easy plants are java fern and anubias, IMO. Hard to kill! Neither bury into the substrate, which is their only downfall, but if you have less-than ideal substrate, theyre awesome.
Neither need fertilizers, neither need too much light, nothin'! Theyre cheap and readily available at many pet stores, especially petsmarts, where they come in tubes (made by top fin). You may have trouble finding moss unless you buy online.