First, let me emphasize there are many ways of smoking or eating hashish or marihuana. This is just one. There are even many different ways of rolling a joint. This is just one I like.
Gather the following items:
a quantity of the semi-legal or illegal substance,
Hash: resin from the hemp-plant ("cannabis sativa") pressed together in little cubes or slices, colour ranges from light brown to black.
Or Weed (marihuana): dried flowering tops of the female hemp-plant, looks like dried flower-tops or (when cut:) tea-like, colour ranges from grey-green to brown-green.
a pair of scissors, to cut the weed
only if it needs cutting, of course
tobacco,
either rip open a cigarette for this (but it's tobacco will be difficult to work with) or buy hand-rolling tobacco.
cigarette paper
Large ones, preferably. Little papers can be "glued" together to become large ones
A piece of thick paper
Width about 1.5, length about 6 centimeters. This paper will be rolled into a little shaft/tube to form the mouthpiece of the joint.