Help with cartoony texturing

Hey! So, I’ve been working on my building recently and I want to add some high quality textures to parts, however I can’t seem to make good ones or even if I do they end up stretched or just seem off.

I’ve searched for a while but can’t seem to find anything that helps much, and I was wondering if any of you had any tips or places I could find some.

I’m trying to create something like this:

If any of you can help me that would be great! Thanks!

Edit: Basically I just need help knowing a good place to find textures like the one shown or tips on making my own.