Aim to keep surface areas clear-counters, tabletops and dressers. Keep as little out as possible. This will get you visually used to a clear space. Force you to find homes for belongings. Makes cleaning easy.
This is a foundation to an organized space. When you are visually used to something being clear, you will automatically start keeping it clear. Develop the habit of checking before leaving a room for anything that needs to be put away or carried out.