To make wheat paste, you need distilled water, wheat flour, a heat source like a stove, a pot to boil the water in, a container to put the finished product in (like a plastic container) and something to stir with.
Bring two cups of distilled water almost to a boil. Try to get as close to boiling as you can without actually boiling the water. Place six tablespoons of wheat flour into the plastic container and add just enough cold water so the flour gets runny. Stir the cold water and wheat flour until it is well mixed, then pour it into the pot of hot water, stirring it as your pour. Turn the heat up to high and bring the whole mixture to a boil. Continue stirring the mixture as it thickens. Once it is consistently thick, turn the stove off and allow it to cool. Add two table spoons of sugar and stir it up for added strength. Once the mixture is room temperature, it is ready to use.
For a quick batch of wheat paste, put one tablespoon of wheat starch and five tablespoons of distilled water into a microwave safe container. Stir the mixture until it is blended and microwave it for about 20 seconds. Remove the mixture, stir it and microwave it for another 20 seconds. Repeat this process until the mixture has a stiff consistency and is translucent.
To use the finished paste, you need a brush, something you wish to stick, some gloves to prevent you from getting the glue all over yourself and a wet rag. Once you have decided where to stick your item, wipe the area clean with your wet rag. Apply a thin coat of wheat paste to the area with the brush. Place the item you want to stick on the area and rub it smooth. Once the paste is dry, your flyer, poster or leaflet is very thoroughly stuck.
If you are using wheat paste to hang things outdoors, you might want to weatherproof them, and this be done quite simply with wheat paste. Once the item has been stuck down, apply a second coat of wheat paste smoothly over the surface of the item. This second layer will not only make whatever you are sticking even more difficult to take down, it will protect it from the elements.