Does anyone know what the small flag used by tour guides usually looks like?

There are triangular ones and rectangular ones. Above is the name of the travel agency. The color is usually red, blue, or yellow. The words can be white, red or yellow. They are all more conspicuous when paired together. Let your visitors see your location from a great distance. There is no fixed size either, but it cannot be too small. Flagpoles generally use telescopic poles, which are easier to carry.

My original flag was a rectangle with yellow and red letters, about the size of two standard magazines.

:)