Ensure you plan it out first, bear in mid the size of you baking trays.
MAKE A BASIC MODEL OF 4 WALLS DOOR AND ROOF OUT OF CARDBOARD AND TAPE IT TOGETHER LIGHTY.
The 6 pieces will be your template for cuting out you biscuits. ensure they all fit onto you baking tray if not the model is too big.
Use a basic biscuit mix and roll out on silicon paper to a thickness of about 5-8 mm no thinner cut out using the templates you made slide onto the baking tray leaving it on the silicone paper.
Bake off all the pieces and allow to cool, use a large board cover in foil as a base and construct the house sticking it together with royal icing decorate with sweets, smarties jelly tots ect at will, if you want windows and doors cut out before baking and use leaf geleting as glass and choc match sticks as a log door, these can also be used on the roof or you could also use choc thin dinner mints as tiles.
Make sure you don't make it too soon as the bisciut will go soft.
Good luck with your first one it gets easier after the first 5, im sure you will have fun and may even supries your self, you can fill it with sweets and light it up with christmas light too.