This is what I use for my basic doodles. I also use micro tipped and fine tip Sharpies as well as Prismacolor pencils. I never use a ruler.This fish will be the project I am going to start now. It's very small the paper is only 5" x 8". I start in pencil as I may want to adjust the boarders as I go and they can be erased as needed.
Here are the doodles I played with to decide what to use first. I think I'll put the tear drop shape on most of the body because it looks a lot like scales.
Here is how it looks with the first set of stripes on the body done.
Here is the rest of the body stripes done and the beginning of the tail. Not sure how I want to go from here.