I usually do an image search on google say, quebec license plates, then I copy the picure on an excel spread sheet , resize the picture to 1/25 or 1/24,then print on photo paper, cut out and glue it with either mod podge or micro krystal clear or even white glue. Thru trial and error I made templates for both 1/25 and 1/24 an all I have to do is to resize the pictures to fit the grid on the template. I have plates from the early 1910's to present. I have plates to last me a long time. I have some from the states , ontario and different other places. I even took a picture of my own car and put on the model I made of it.
hope this helps.