When I started mark making I was so protective of my supplies that I would only make tiny things. I would cut my paper up into little squares, and tape off every sketchbook page into six small spaces. I loved making small things, and they are still my go-to thing in day to day quick practice.
But I have to tell you: painting big is fun. It seems to come out of a different part of my brain, and it certainly comes out of a different part of my body: large marks come from the elbow and the shoulder or even the whole body instead of the wrist and the hand, and it's a thrilling (and ergonomically nice) feeling. Here are some ways to try it out: