In my personal practice I've often seen drastic changes in the very beginning of my work. The first few sketchbooks may look extremely different from each other. And that's okay! You are improving as you go, with each sketch you learn how to hold the pencil, how to draw so begin practice and focus more of quantity in the beginning, we will focus on quality after we have a basic set of skills.
Let me know if you have any questions regarding your current stage of art, or if you'll like to start it practicing but don't know where to begin.
Happy sketching!
Vidushi