well starting of as a terrain making seems pretty hard at the begining but you get really used to it when you start making more and more stuff
like ork huts, tau out post and even flames of war stuff. here is my list of stuff you should use (that is cheap) for making terrain

PAINTS:
AMERICANA:
white wash
DECOARTS:
burnt unber,x-mas red, bright yellow,black, blue, soft seued and more.
PRICE FOR DECO ART AND AMRECANA PAINTS: 99 cents a bottle
CUTTING TOOLS:
bread knife
box knife
xacto knife
hand saw
power saw
PRICE FOR THE TOOLS:
bread knife 1.00$
box knife 2.00$
xacto knife set 5.00$
hand saw 1.00$
power saw 40.00$
BASING:
hardboard
cardboard
plastic card
PRICES FOR BASING:
hardboard 5.00$ for big sheets
cardboard FREE
plastic cards 1.OO$ for pack
STYRAFOAM:
polystyrene (pink and blue)
packing styrafoam
AND PRICES:
polystyrene 11.00 to 12.00 $ (for 2x4 sheets)
shipping foam FREE
well ther is my list of stuff and prices for matrials for making WARHAMMER 40K terrain check my youtube channles here --->www.youtube.com/homeTERRAIN THANKS!!