Texture production?

[L i am]

Hi Guys, I have been given a job to model a local government sports pavilion, The roof has me pretty scared I have attached an image or 2 that was done by the Architect it is a block sketch so not suitable for a render. Anyway my main point is that I am required to build the very complex design. Additionally I will be required to produce some high quality texture. I have attached an image of some of the bricks (there is actually 10 different types of custom bricks which is scary. Anyway I am trying to contact the brick makers and am awaiting a call to see if they have the textures for my needs, but I am thinking they may not have them.

Could somebody please let me know how to produce the textures myself using some app, or even AI. I can easily produce normal maps but the tiled primary tenure is what I am concerned about. I could get them done on fiver but that does not always go well in communication issues, I have ven considered doing the bricks with geometry but am unsure about the file size.

Any suggestions/ advice please?