As with most things, painting is done best in natural light. Set up your painting station near an open window or a room that has a lot of natural light. You’ll be able to see small nuances in your brush strokes and colors that you wouldn’t otherwise be able to pick out. Each artist has their own way of setting up their supplies, but it is best to get them all placed how you like them before you start painting. Fill your jars with water, get out the paintbrushes and paints you want to use, and put your palette in the most ideal location. You may want to put on your smock or old T-shirt at this time as well. As a beginner painter, you may have an idea of what you want to paint, or you may be looking for some direction. Think about possible subjects or models you could use for your first painting. It is easiest to work from a 3-D object or photograph, rather than putting paint to something from memory. If you’re not sure what to paint, easy paint subjects for beginners include:  A bowl of fruit A vase of flowers Objects in your home A sunrise/sunset If you feel confident in your ability to paint exactly what you see, then you can go ahead and jump right into the painting. Most people, however, require an outline to follow along with their paint brush. Use a regular pencil to roughly sketch the outline of major shapes directly onto your canvas; don’t worry about details or shading too much. You can do multiple sketches on paper before ever turning to do one on canvas, just to make sure you are confident with your drawing of your subject. It is a common mistake to mix paints as you work, rather than mixing them all before you start. Use your time and paint efficiently by mixing all your paints - in all the colors you need - prior to starting your painting. In this case, it is better to be safe than sorry by mixing more paints than you are likely to use. You can store extra paint for future paintings, but it will be nearly impossible to mix the exact shade of paint twice.  Use a color wheel as a helpful reference...

TL;DR in Chinese:
选择好地点。 摆好所有用具。 决定绘画的主题。 创作草图。 调制颜料。