What you need:

Paper:

The art of wheat pasting begins with thin paper. The thinner the paper, the better it will conform to the confines of the surface. Anything thicker than common office paper is not suitable for wheat pasting. The best paper is thin enough, without being too transparent, such as newsprint or bond paper.

Paste:

Once you have created your artwork, and cut it how you wish, make a batch of wheat paste. Get instructions here.

Brush:

You will need a brush to apply the wheat paste, and a container to hold it in. Depending on the level of mobility required containers can range from a bucket, to a pop bottle, to a squeeze ketchup container.

For a brush, head to the wallpaper section of your local home improvement store. Depending on how lucrative the store is, will depend on the variety of brushes. You should easily be able to find a hard bristle brush, and / or a deck brush.

A ‘janitor’s brush’ also known as a ‘elephant brush’ is great for attaching to a pole / handle and getting to higher and harder to get to areas.

A regular paint brush will not work, because you need to be able to push the paper into the cracks and crevices of the surface you are working with.

A paint roller is also not suggested, unless you like the sensation of sticking your face behind a truck wheel when it’s trying to get out of the mud.

Method:

Apply a liberal amount of paste to the area you are working on, proportionate to the size of your artwork.

Place your artwork over the paste, and push on it enough so it sticks itself to the surface.

Apply a coat of wheat paste evenly to the artwork, and make sure to press hard enough for the artwork to adhere to the surface without any gaps.

Make sure to push all the air bubbles out. Start from the middle, and push outwards until all the bubbles are gone.
Photograph, pack up, and run.