Perlite is the little white balls you find in pots at home depot or any other nursery that sells plants,.. i had no idea what perlite was either untl i saw the bag
what i do when i plant my neps is,... i have a bag that i bought from Wal mart,, or any other store, its called Orchid Bark, i think its by better gro, its a mix of orchid bark, charcoal, and perlite,. i put about 1-2" of that on the bottom of my pot, then i take a container and take 1-2 hand fulls of scultz sphagnum peat moss,.. and put it in the container (depends how big the pot is), ... then i take about half a hand full of perlite from schultz also and add that to it,... i take about a hand full of the orchid bark and add that too, THEN i take the long fibered sphagnum which is from bettergro and i put that there to, i add water and mix it all up, then i put it in a pot
those are the ingredients i use,... you kinda have to guess how many hand fulls and stuff to take cus every pot size is different,.. you should be able to get the idea from what i wrote, i use that for all my neps,
and when you add the perlite, try not to put to much becuase if you do youll have white balls everywhere and it wont look as good
after i mx everythihg together and add the plant in the pot i take some live sphagnum moss and put that on top
i hope i helped you