Most people overcomplicate this.
I spent years carrying a leather-bound notebook with heavy paper and a handful of expensive pens before I realized I was working against my own setup. The journal was becoming a performance instead of a tool. Here is what actually works after several years of daily practice across illustration, architectural sketching, and character design work. Start with a simple A5 stitched or spiral-bound notebook. Cotton paper at around 120gsm handles light pencil, ink, and thin wash without bleeding through. Skip the heavy 200gsm stock. It feels premium but makes page-turning a pain and the book thick enough to be uncomfortable in a bag. A5 is the practical middle ground. It fits on a small desk and still gives you enough room to work without squeezing. For tools, keep it under five items. A HB pencil, a 2B for darker lines, a fine liner at 0.5mm, a brush pen or a small pointed brush for quick washes, and an eraser. That is all you need. I once carried six pens and three pencils and ended up spending more time choosing the right tool than actually sketching. This usually cuts the setup time down to under two minutes.
The method I use is straightforward. Open the page, write the date and a one-line subject. Then start drawing immediately. Do not plan out the entire page in your head first. The sketchbook is for visual thinking, not for producing polished illustrations. Let the marks be rough. Your job is to capture shape, gesture, and relationship between objects. Rendering details in the journal is one of the most common mistakes beginners make. You will get stuck on a single element and lose the energy of the whole page. I used a template method once where I divided each page into four quadrants and assigned each one a specific exercise. Gesture in the top left, still life in the top right, and so on. It felt structured but it became rigid. Some days I would stare at the page and not know where to begin because the framework demanded something I did not have the energy to draw. I dropped it after three weeks. Free pages without constraints work better for me. Leave white space between sketches. A page with three quick studies and breathing room is more useful than a page completely filled with overlapping lines. When you revisit the journal months later, you need to be able to find individual sketches and remember the context. Dense pages turn into a mess you avoid opening.
Here is an edge case that costs me time. There was a period when I sketched exclusively in Pen and Ink, and the ink bled through the paper on almost every page. I had used 90gsm paper, thinking it would be thin and portable. It was neither. The bleeding ruined three full spreads in one session. I switched to 120gsm cotton paper and started using a lighter hand with the brush pen. The bleed stopped and the journal stayed usable. If you are working with wet media, do not skip the paper weight check. It matters more than anything else in the setup. Another thing beginners miss. You do not need to draw from life every single session. Reference photos, previous sketches, or even a magazine page work fine for certain exercises. Trying to only draw from life limits what you can sketch when you are commuting or stuck indoors. Use references when they help. Use life when it is available. Both feed the same skill. There is a downside to this approach that I should mention. The simplicity means there is no external structure pushing you. If you go two weeks without opening the journal, there is no deadline or assigned topic forcing you back. You have to rely on your own habit loop. I found that keeping the journal visible on my desk, not tucked away in a drawer, made the difference. The friction of finding it was enough to stop me from starting most days.
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Speed matters more than perfection here. A sketch that takes three minutes and captures the essence of something is worth more than a sketch that takes twenty minutes and looks like a decent but lifeless copy. Your hand learns through repetition of observation, not through finishing every mark. I have pages full of hasty, ugly lines that taught me more about form and proportion than any carefully rendered drawing ever did. Review the journal periodically. Once a month, flip through recent pages and notice which sketches feel alive and which feel stale. That feedback tells you what to adjust. Maybe you are spending too much time on small details. Maybe you need more variety in your subjects. The journal itself becomes a record of your development without requiring any formal evaluation system. A5 stitched notebook, 120gsm cotton paper, five tools max, date and subject line, quick sketches with room to breathe. That is the system. It works because it removes barriers between you and the act of drawing, not because it is complicated or refined in any meaningful way.