Making a drawn texture look acceptable as a texture

[L i am]

I am trying to work out how to make a cad elevation of some complex brickwork I tried to import some textures of bricks and painstakingly " put different brick textures but could not get it to work.............and life is too short, and I was not very successful. Can anybody tell me how to add bump or some other way of making these cad elevations look acceptable on my model so it renders OK?
Any ideas?

Thanks